Disable User Tracking

[HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer]
"NoInstrumentation"=dword:00000001

The user tracking system built into Windows XP is useless to 99% of users, and it uses up precious resources to boot, so it makes sense to disable this "feature" of Windows XP. To do so,
click on run in Start menu(WinKey+R) and Type Regedit.
Now Browse to

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer

and find the DWORD NoInstrumentation.

You may need to create this key if it is not there.
The default setting is 0, but setting it to 1 will disable most of the user tracking features of the system.