It's true Siginets integrator (Or RVMi as most call it) does the same thing when it "Optimizes System Files". Remove 1 little thing with nLite and then compare your txtsetup files (So nLite would only be removing 1 or 2 lines, just enough to kick it in). You'll find nLite's is smaller, organized and alphabetized. Doesn't seem like it would do anything but Siginet and I did some real life testing and it does shave a little time on the installation process. Edit: Plus MS really did a sloppy job on those files. Have you actually looked all the way through a txtsetup or dosnet file? Whats with all the dead space and disorganization? Edit 2: Reg tweaks = http://www.kellys-korner-xp.com/xp_tweaks.htm heres a BUNCH of reg tweaks. Plus I will upload a tool made here that has a large reg tweak database. It wasn't updated for SP3 but almost all of the tweaks are still good. http://www.wpiw.net/UARegistryTweakageDOTNET0.4.1.exe