Been a while, but I re-ran this script on my box again and found that it also stores the registration information of a couple of my programs. One of them was QuickTime 7

Supposedly this will disable the logging
Code:
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\UserAssist\Settings]
"Instrument"=dword:00000001
"NoEncrypt"=dword:00000001
"NoLog"=dword:00000001


However I'm not positive if it will or not, but using a policy on XP will.

Code:

Windows Registry Editor Version 5.00

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

 
You will still have to delete the values or keys if you don't want the old history. But then new stuff should not be created.