if you tweak xp too much and turn off multiple things, including the 8.3 file name creation for NTFS partitions, installs that are/or use 16b embedded apps will freak outout in long filename folders.
You can move the offending app to a shorter named folder but this doesn't always work. Always create at least 1 extra admin account that you leave as the standard install(no tweaking it now, NO TOUCHIE). then when this prob or some other overtweaked nusaince pops up you right click on the offending file, choose run as, select your fresh as a daisy never been tampered with extra admin account, type in pass and everything will work hunky dory
Installs like yahoo messanger, audiograbber, creative drivers....all use 16bit progam install either in part or in whole. Most annoying really