I have had this crop up on a couple of systems so far and I have not found *any* *real* fix for it... This is especially frustrating when a program that was working fine suddenly starts giving this error... (I use "List.Com" a lot at home.) So far, the only fix I have found is to run WinXP's Repair Function... I really wish I knew which Registry or Software Modules were involved though... BTW: So far I have been very pleased with WinXP's repair function... I am not talking about the Repair or Recovery "Console"... If you boot from your Install CD and let it go through the initial Setup Screens until *after* it has looked for and found the original Windows Installation you can then use the install Function... It looks like it is doing a normal install but it leaves all your programs and profiles intact... It will also ask for the CD Key (I believe it is the key from the disk you are doing the install from).