Type 10 error with 9.2.1 update

I'm trying to update one of our 9.1 G4s to 9.2.1 but keep getting a bomb & Type 10 error when there's a minute left to the update. I've tried several times and get the error every time; I've also chosen the "standard" extensions setting, restarted, and tried the update and get the same error. I've checked around the web and can't seem to find any useful leads as to what I can try to remedy this. Any suggestions?

m19

Well... It must've been an extension; rather than setting it to "standard" I disabled extensions altogether and both 9.2.1 and 9.2.2 installed just fine. A desktop rebuild later (just for spring cleaning's sake), and 9.2.2 is running great.

m19

Good to hear.