>>Printer drivers. You forgot printer drivers.
>
>Shouldn't SP3 or 4 fix those problems?

Almost all of them. However, there are a few bugs in those drivers that we simply can't control, and C5 errors can still occur. I'll admit, your suggestions are the place to start, but buggy printer drivers still can't be entirely ruled out.

If a problem is consistently reproducible even with the latest SP, the _fpreset() trick might still work, but don't get your hopes up.