Load your computer in Safe Mode (if you cannot load properly) and begin:

1 Way. Windows XP cleanup - Speed Up My PC
Clean up of hard drive: Start - All Programs - Accessories - System Tools - Disk Cleanup, select С drive and ОК

calculating...

select follow rows Downloaded Programs Files, Temporary Internet Files,
Recycle Bin, Temporary Files, then ОК and ОК

2 Way. Windows XP cleanup - testing of hard drive
Test a hard drive - this option will check a drive for errors:

• Close all files and programs.
• Click Start-My Computer.
• In the My Computer window, right-click С drive and click Properties.
• In the Properties window, click Tools.
• Then click Check Now
• In the Check Disk dialog box window select the Scan for and attempt recovery of bad sectors check box.

and click Start.
If the bad sectors are found, choose to fix them.
If it doesn't help, regenerate bad sectors.

3 Way. Windows XP cleanup - Speed Up My PC
Remove $NtUninstall and .log files - click Start, in the open box, type C:\Windows and press Enter. Find and delete all the files: $NtUninstall and .log

4 Way. Windows XP cleanup - Remove Temp files - Speed Up My PC
Show protected operating system files:
Start - Settings - Control Panel - Switch to classic View - Folder Options - View,
in the Advanced settings window, unselect follow rows:
Hide extensions for known file type,
Hide protected operating system files (Recommended)
and select: Show hidden files and folders,

click OK.

Then Start - Run, in the open box, type C:\Windows\Temp, and ОК, remove all the files and close window. Double-click My Computer - Local disc: C - Documents and Settings - user's name - Local Settings - Temp, select and remove all the files, close the window. Double-click My Computer - Local disc: C - Documents and Settings - user's name - Local Settings - Temporary Internet Files, select and remove all the files, close the window.
Hide protected operating system files:
Start - Settings - Control Panel - Switch to classic View - Folder Options - View, in the Advanced settings window, select follow rows:
Hide extensions for known file type,
Hide protected operating system files (Recommended)
Do not show hidden files and folders,

click OK.

5 Way. Windows XP cleanup - Speed Up My PC
Add or remove unused Windows components - they further use of computer resources - click Start - Control Panel - Add or Remove Programs - Add/Remove Windows Components, unselect all unused Windows XP components, select follow components:

• Accessories and Utilities
• Internet Explorer
• Networking services
• Outlook Express
• Update root certificates
• Windows Media Player

then Next - Finish. Restart computer.

Attention
You can also add Windows components - click Start - Control Panel - Add or Remove Programs - Add/Remove Windows Components, select the check box that you want to add, Next, insert a Windows XP disc, OK - Finish.

6 Way. Windows XP cleanup - Windows startup programs
Increase a speed of startup for Windows XP. Start - Run, in the open box, type msconfig, then click ОК and Startup. Unselect all unused programs from the list and

click Apply - OK . Restart computer.

7 Way. Windows XP cleanup - Add or Remove programs - Speed Up My PC
Remove all unused programs - more space, more reliable operation of the PC. Click Start - Settings - Control Panel - Add or Remove Programs, in the opened window select unused program, then on the right click Remove

and then follow the instructions to remove.

8 Way. Windows XP cleanup - Disc defragmentation - Speed Up My PC
Increase a speed of Windows XP - click Start - All Programs - Accessories - System Tools - Disk Defragmenter, in the opened window select disc drive, click Defragment. It starts the defragmentation process - it takes 0,2 - 2 hours.

In the Disk Defragmenter window, click Close.

Repeat for all the drives.

9 Way. Windows XP cleanup - Speed Up My PC
Doping for the hard disk - UDMA66 - Start - Run, in the open box, type regedit, click ОК. In the opened window on the left double-click:
HKEY_LOCAL_MACHINE,
SYSTEM,
CurrentControlSet,
Control,
Class,
{4D36E96A-E325-11CE-BFC1-08002BE10318},
{0000},
on the top of window click Edit - New - DWORD Value, type EnableUDMA66

and Enter.

On the top of window click Edit - Modify , in the

opened window, type 1, click ОК.

10 Way. Windows XP cleanup - Speed Up My PC
Rebuilding damaged Windows XP .Dll files - click Start - Run, in the open box, type cmd, click ОК. Type: sfc /purgecache and Enter. You must see: Windows File Protection successfully made the requested change.

11 Way. How to clean your registry - software registry cleaner
Registry Cleaner - all the details, but if you are sure in yourself, you can clean up registries yourselves - 12 way. If your computer works well again, you can do next - 13 way else you need System Restore.

12 Way. How to clean your registry - manually registry cleaner
Registry Cleaner - remove the recording has been erased or improperly erased computer programs - click Start - Run, in the open box, type regedit, click ОК. In the opened windows on the left double-click inscriptions:
HKEY_LOCAL_MACHINE,
SOFTWARE,
right-click the name of the program (already erased), then click Delete - Yes .
Click Start - Run, in the open box, type regedit, click ОК. In the opened windows on the left double-click inscriptions:
HKEY_CURRENT_USER,
SOFTWARE,
right-click the name of the program (already erased), then click Delete - Yes.

13 Way. Windows XP cleanup - Speed Up My PC
Remove old restore points. Click Start - All Programs - Accessories - System Tools - Disk Cleanup, select C drive and click ОК, calculating, in the opened window (the second picture of the way 1), on the top click More Options, then click the third button Clean up from the top, then click Yes - OK - Yes.