Heh.
If your bios was ****ed, resetting it via jumpers on the mobo would have fixed the problem.
Therefore, the problem is not with your bios. So you can rule that out.
When you turn on your computer, does it "beep" at all? If not, can you do things like, eject your cd-rom/dvd drive ? (If not, your power supply may have **** a brick).
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As for the other random bull**** in this thread:
Windows Updates don't DIRECTLY affect MSN Messenger, they patch native vulnerabilities in Windows itself. Maybe if said program was exporting functions from a system DLL file, and that code was patched to prevent exploits, then that would be a valid statement, but that is most likely not the case.
Cracking is a commonly misused term. The "media definition" (what they like to call people who "hack" websites, since "hacker" has lost its oomph in the modern 1337 age) is what SoulStriker said. It
really means to reverse engineer software/components of a system to circumvent copy protections and other nonsense. A cracker generally edits programs in assembly/hexadecimal. ( I know, because I am one =p )
http://anime-overload.com/images/omgh4x.jpg <-- common tools
http://anime-overload.com/images/cracker.jpg <-- t-shirt, for the win