Who says you need to format?
Right, well even if we pretend for a second that the OP didn't say "Anyway, gonna check with ubuntu," it really doesn't make it any less sensible to back up and do a clean installation of the above operating systems is significantly more sensible than installing over the old operating system and being left with a very sloppy file system. Vista (and I believe 7) is particularly faulty with this because of it's terrible Windows Side-By-Side folders.
So to answer your original question... nobody said he "has to" reformat... but why shouldn't he? To me, it's like you're telling a guy with a key to a door that he doesn't "have to" use the key... he can always just kick down the door.
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C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
Yes, I think you're right, though I don't really see the need to check overheating issues after he already realized his issue was the operating system. Regardless, it doesn't change my point. Backup and clean install always works better than installing over. To me that's like painting over paint without putting a primer first.
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