This is mostly a concern with some business applications running database applications, but they changed from MDAC to WDAC (same as Vista) or database access.
It had a known corruption issue on our application, and I heard reports of other enterprise applications have issues as well.
For home users, I think it's pretty much a non-event.
diyrich, if you're using a legit copy of Windows you should be OK. If using a hacked copy, you will not recover from Win XP after upgrading to SP3 without re-installing a fresh copy.