Introduction:
How to fix a computer that won't start
How to fix PC
How to restore, refresh or reset your PC
Windows Startup Settings (including safe mode)
Windows hangs or freezes
Recovery:the last step in total data security
When Some Websites Do Not Open On Your Computer – Troubleshooting Guide
How to check if system Is 32-bit or 64-bit (x86 or x64)
System Update Readiness Tool
How to Repair a Windows 7 System with an Installation Disc

System Restore:
Quick Restore Point Maker
System Restore Explorer
Restore Point Creator
Fix System Restore Calendar
Automatic System Restore Maker

Troubleshooting/diagnostic:
How to troubleshoot a problem by performing a clean boot in Windows
Resolving blue screen errors in Windows 7
BSOD Index; Bug Checks (Blue Screens) 
Demystifying the 'Blue Screen of Death'
Blue Screen of Death Survival Guide: Every Error Explained
Windows Stop Errors or Blue Screens Guide and Resources
Windows Error Codes
System Error Codes
Events and Errors Message Center
Microsoft Exchange Server Error Code Look-up
Windows Error Lookup Tool
Error Messages for Windows
Carrona.org
Memtest86+
MemTest86
Windows Memory Diagnostic
Victoria
MHDD
SF Diagnostic Tool
Problem Steps Recorder
Beep Codes Viewer
See also in this list: Test system stability
See also in this list: Monitor errors

Versatile tools for troubleshooting/rescuing:
Windows Repair Tooolbox
Wise PC 1stAid
Farbar Recovery Scan Tool
Microsoft fix it center; portable
Admin Swiss Knife Suite
TechTools
NirLauncher
Windows System Control Center
Windows Repair (All In One)
KZTechs.COM Software Suite
d7
Advantage-PC Fix
PC Tools by Davis PC Mechanics
Helge’s Switchblade
GEGeek Tech Toolkit

Memory dump:
Overview of memory dump file options for Windows
How to Create a Full Memory Dump
How to analyse memory dump
volatility

Repairing XP:
Recovering Windows XP using the Recovery Console
How to install and use the Windows XP Recovery Console
Repair XP
How to Perform a Windows XP Repair Install

Windows rescue discs/USBs:
Download Windows 7, 8.1 or 10 ISO Images Direct From Microsoft
Create a system repair disc
Installing Windows 7 System Recovery Disc onto USB Flash Drive
Create a WinPE (Vista or 7) without WAIK
WinUSB Maker
GImageX

Rescue discs:
UBCD4Win
Rescatux
Trinity
Ultimate Boot CD (UBCD)
Hiren's boot cd; download
Paragon Rescue Kit
SystemRescueCD
Knoppix
BartPE
BootDisk
OTLPEStd; Installing OTLPE on a Flashdrive
Secured2k's Boot CD
INSERT
Ubuntu Rescue Remix
Lazesoft Recovery Suite Home
Lazesoft Windows Recovery Home
f4ubcd
More

Linux live CD:
Lightweight Portable Security
Puppy
Slax
Webconverger
Finnix
Privatix Live-System
Cybershield-OS
KNOS Demo

Disk management:
Parted Magic

Partition/disk recovery:
Minitool
TestDisk
Partition Find & Mount
Eassos Recovery Free

Partition software:
Best Free Partition Management Software
Easeus
MiniTool
Paragon
Gparted
AOMEI Partition Assistant Home
Cute Partition Manager
Ranish Partition Manager
PartitionGuru Free
Macrorit Disk Partition Expert Home Edtion

Fixing MBR:
8 Free Tools to Backup and Restore the Master Boot Record (MBR)
Fixing MBR

Boot CD registry editor:
PC regedit

BIOS:
How to enter BIOS
How to set BIOS to boot from the CD
Changing Your Computers Boot Order
Easily Install FreeDOS in USB Flash Drive for BIOS Flashing

Safe Mode:
How to Start Windows in Safe Mode
How to easily enter safe mode in windows 8?
BootSafe
Enable booting in safe mode
SMFixer
Repair Windows Safe Mode

Solve problem drivers:
Driver Fusion
BlueScreenView
Whocrashed
Identify Which Service or Driver Failed During System Startup
Using Driver Verifier to identify issues with Windows drivers for advanced users; Driver Verifier
Driver Reference Table
See also in this list: Device & driver analyzing
See also in this list: Updating/searching for drivers

Recover a hanging system:
Antifreeze

Repair Internet connection:
Troubleshoot network connection problems in Windows
Fix Internet Connection after Malware Removal
How can I reset the Hosts file back to the default?
Complete Internet Repair
WinSock XP Fix
Winsockfix
Lspfix
MiniToolBox
Farbar Service Scanner
Autodebug for Winsock
Repairing of broken internet connection
Reset-TCPIP
Connectivity Fixer
Avira DNS Repair-Tool
Repair Winsock & DNS Cache
NetChecker
Why Can't I Connect?
3DP Net (network drivers)

Restore corrupted system files/settings:
Subsections follow.

1. General:
Re-Enable
FixWin Utility
7 quick fix
Remove Restrictions Tool
XP Quick Fix Plus
Dial-a-Fix
RefreshPC; review
Tweaking.com
Virus Effect Remover
Windows medkit
MBR Regenerator
Quick Disaster Recovery
Turn off “Autorun” and “Default Share” download
How to Repair a Windows Image (DISM tool)
See also in this list: Integrity checking

2. File association:
Fix corrupted .exe association: 1; 2; 3; 4; 5; 6; 7
File Association Fixer; File Association Fixes for Windows 7
File Extension Fixer (ExeFixer)
Default Programs Editor
Types
Repair .lnk (Shortcuts) File Association
Broken shortcut fixer
Unassoc

3. Permissions:
GrantPerms
Fixpolicies
Reset Registry Permissions
Permissions Time Machine

4. Security settings:
How do I restore security settings to a known working state
Security Restore

5. Removable storage:
DVD repair
USBOblivion
DriveCleanup

6. Additional:
How to Restore Missing Default Shortcuts in the Windows 7 Start Menu
Microsoft .NET Framework repair tool
Recycle Bin back to desktop
RestoreTaskBar

Repair corrupted IE:
How to reinstall or repair Internet Explorer in Windows
Repair IE
SF IE Restoration
Repair Internet Explorer

Restore Task Manager:
Task Manager Fix
Enstella Task Manager Enable Tool

BIOS password recovery:
How To Reset, Remove, Clear or Reveal CMOS BIOS Security Password
Manually Reset BIOS Password Like a Hacker to Access CMOS
BIOS Password Removal for Laptops
CMOS De-Animator
PC CMOS Cleaner

Recover installation keys:
Magical Jelly Bean Keyfinder
Recover Windows key for unbootable system
SoftKey Revealer
ProduKey
LicenseCrawler
RockXP
Win Key View
WinKeyFinder
Advanced Tokens Manager
CD Key Seizer
Lazesoft Windows Key Finder
Recover Windows Key for unbootable system with Hiren's boot cd

Recover/reset Windows passwords:
How to reset windows account password
Kon-Boot
Cain&Abel
Ophcrack
PCLoginNow
Lazesoft Recovery My Password Home
Reset a Windows 8 Password without using any third party software

Recover other passwords:
Forgot Your WiFi Password? How to Find It in Windows
Reveal Passwords Hidden Under Asterisks
Reveal a Password in your Browser with a Simple Trick
Password Recovery Tools
Windows Password Recovery Tools
Recover router password
Routerpwn 
WifiSlax
WebBrowserPassView
Advanced Password Recovery
hashcat
John the Ripper
Online Trillian Password Decoder
Hash Kracker
OTFBrutusGUI
aBhacksPsw Lite

Recover documents:
Recover Word documents
Recover Excel documents
Recover Excel/Word documents
Recover ZIP-files
ZIP repair
How to recover corrupt Microsoft Word files

Clean & update Windows install CD:
nLite
RT Se7en Lite
RVM Integrator
Win Toolkit
Windows 7 Component Removal (beta)
vLite
WinFuture xp-Iso-Builder
NTLite
Create An Integrated Up To Date Windows 7 Install Disc

Make bootable Linux USB:
UNetBootin
LinuxLive USB Creator - LiLi
MultiBootUSB
Universal USB Installer

Make bootable Windows installation USB:
Windows 7 USB/DVD download tool
RMPrepUSB
A bootable USB
WintoFlash
MakeItBoot
WiNToBootic; review
Rufus
WinUSB-Maker
DriveDroid; guide
A Bootable USB: Freeware to Create Bootable USB Drive to Install Windows Vista and Later

Windows reinstall guides:
How to Rebuild your Computer
Windows reinstall
Install, reinstall, or uninstall Windows
installing windows xp from a usb key
No-reformat, nondestructive reinstall of Win7
See also in this list: Tools for speeding up (re)install

Other:
CheckDiskGUI
How to use SysPrep to Generate Unique SID before Cloning
How To Fix “BOOTMGR is missing” Error in Vista and Windows 7
Windows Leaks Detector
Restoring Factory Hard Drive Capacity
The Backup Failed when Creating System Image in Windows 7
How to initialize a hard drive in Windows 7
Manually Reset or Clear Dirty Bit in Windows without CHKDSK
Boot an ISO directly from the Windows Boot Manager
How to Fix Problems When Windows Installer or Uninstaller doesn't work

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