That was definitely part of it... as XP SPs released, they locked down application access to read/write where applications typically shouldn't, including in the

That was definitely part of it... as XP SPs released, they locked down application access to read/write where applications typically shouldn't, including in their own Program Files directory, and this did bork some applications even though it was supposed to redirect the changes to a different directory. So many poorly written applications broke through those days. I may be thinking of Vista/Win7 though, the time has muddled my brain a bit.