I have PDVD7 Ultra, 8 Ultra and 9 Ultra installed on my desktop. I mentioned several days ago that I renamed the folders of 7, 8 and 9 and the problem went away with the BSOD page fault in XP SP3 with avast! free v5. It is now several days later and I have not had any BSODs. I did this with my laptop and other desktop (which have the same configuration), and while they were having the same BSOD issue, after renaming the folders, there is no such BSOD, and the system is stable. It is not clear which version of PDVD is causing the issues, but I would suspect v7 and v8 do but not v9, as I can run v9 and avast at the same time without crashes. The problem has been narrowed down somewhat, so it shouldn't take too long to come up with a fix. If someone could post when a fix for this has been issued, that'd be helpful. I'd like to rename the folders in time....