Browsing Software Hack/Tweak
Disable System Restore in Windows 7
You've removed temp files, cleaned off the IE Cache, removed old downloads, and you still don't have enough drive space to install that great game.
IRQ Priority Tweak
You will need to create a new DWORD: IRQ#Priority (where # is the number of the IRQ you want to prioritize) and give it a setting of 1.
A faster NTFS file system
You probably use the NTFS file system (see the properties of your C: partition).
Use Cached Exchange Mode Option is Grayed Out
You can't enable Use Cached Exchange Mode because it is grayed out.
Create A Huge File
You can create a file of any size using nothing more than what's supplied with Windows.
Disable User Tracking in WIndows XP
Yes, you read it right.
Force XP to Unload DLLs
XP has a bad habit of keeping dynamic link libraries that are no longer in use resident in memory.