Here is the result, however I'm not really certain I used the program correctly-I was a bit confused about how to do it. WindowsXP-KB936929-SP3-x86-ENU.exe 3a85de42bec266e4eb8a717d474b3864 It doesn't match what you posted, perhaps if you could give me a few pointers on how to properly use the program I could make sure I'm doing it right. +=+=+=+=+=+=+=+ FileVerifier++ v0.6.3.5830 (g++.exe (4.3.3-tdm-1 mingw32) 4.3.3) +=+=+=+=+=+=+=+ Starting FileVerifier++ [v0.6.3.5830] Loading module: C:\Program Files\FileVerifier++\Modules\crc.dll Loading module: C:\Program Files\FileVerifier++\Modules\md.dll Loading module: C:\Program Files\FileVerifier++\Modules\rmd.dll Loading module: C:\Program Files\FileVerifier++\Modules\sha.dll Loading module: C:\Program Files\FileVerifier++\Modules\whirlpool.dll ============== Loading Results ============== Loading file: V:\XP SP-3 Install\WindowsXP-KB936929-SP3-x86-ENU.md5 WindowsXP-KB936929-SP3-x86-ENU.md5: MD5 checksums generated by MD5summer (http://www.md5summer.org) WindowsXP-KB936929-SP3-x86-ENU.md5: Generated 3/27/2011 7:53:08 AM Successfully loaded results from file. Edit: Just tried another MS Win XP SP-2 CD, and it failed as well, at the same point. There must be something wrong with the SP-3 download, but I'm going to the link that was referenced, plus I also tried looking for SP-3 "manually" on the MS site, and it took me to the same page. Second Edit: Downloaded SP-3 (again) from the same site, but this time the Nlite extraction worked ok! Don't know what the problem was; I had downloaded it 3 times yesterday (after deleting the previous one), and each time it failed to complete the extraction. Made the disc ok, so "all's well that ends well", I guess. Thanks for the suggestions.