I'll never understand people's reluctance to a wipe and clean install...
Even if i do this another Hundred yrars...
I think there are several schools of thought on this one.
I know someone who wipes his PC every 60 days. I'll never understand why, but it works for him...
Many people view a wipe and clean install as a "cop-out": they never find out what the real problem is, so they decide to resolve the problem and learn something in the process.
Of course some have poor-to-nonexistent backup procedures, so they'll ALWAYS be reluctant to wipe and reinstall.
As for myself, it depends on how much time it takes to figure out or resolve a problem. Since consultants charge by the hour, wiping and reinstalling can often be more cost effective than cleaning off 100+ Trojans. Vista Service Pack install failures are almost always a wipe-and-reinstall in my book, since there are just too many variables with something like that...