WINDOWS XP Speed Tweak

First of all, this tweak only apply to those who only have one HDD on their primary IDE channel (nothing else on device 0 or 1) and a CD-ROM and/or DVD-ROM on the secondary IDE channel. Each time you boot Windows XP, there's an updated file called NTOSBOOT-*.pf who appears in your prefetch directory (%SystemRoot%Prefetch) and there's no need to erease any other files as the new prefetch option in XP really improves loading time of installed programs. We only want WindowsXP to boot faster and not decrease its performance. Thanks to Rod Cahoon (for the prefetch automation process...with a minor change of mine) and Zeb for the IDE Channel tweak as those two tricks, coupled together with a little modification, result in an EXTREMELY fast bootup:
1. Open notepad.exe, type "del c:windowsprefetch tosboot-*.* /q" (without the
quotes) & save as "ntosboot.bat" in c:
2. From the Start menu, select "Run..." & type "gpedit.msc".
3. Double click "Windows Settings" under "Computer Configuration" and double
click again on "Shutdown" in the right window.
4. In the new window, click "add", "Browse", locate your "ntosboot.bat" file & click
"Open".
5. Click "OK", "Apply" & "OK" once again to exit.
6. From the Start menu, select "Run..." & type "devmgmt.msc".
7. Double click on "IDE ATA/ATAPI controllers"
8. Right click on "Primary IDE Channel" and select "Properties".
9. Select the "Advanced Settings" tab then on the device 0 or 1 that doesn't have
'device type' greyed out select 'none' instead of 'autodetect' & click "OK".
10. Right click on "Secondary IDE channel", select "Properties" and repeat step 9.
11. Reboot your computer.WindowsXP should now boot REALLY faster.

What is WinSxS Folder and How to clean it?

The folder contains thousands of files and occupies Gigabytes of space.
Info about this folder
The folder called WinSxS stands for Windows Side-by-Side and is used to store versions of Windows components that are built to reduce configuration problems with Dynamic Link Libraries (DLL Hell). Multiple versions of components are stored in this folder.
In short this folder usually does not contain any useful data contents of which may be deleted to reclaim the occupied huge space.
However cleaning this is not easy if the folder does not get clean up by executing a disk cleanup then you might have to format the system to get the used space.