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protopip: That number is called a SID and it's this number that windows uses to identify a user. The SID is automaticly generated when you create an account.

br_fusion : I'm sure you mean THE...

Well this is usually the case. Your machine has probably been turned into a warez monkey, a DDoS zombie and/or a spam relay.

Either case to be totally sure s/he didn't leave any backdoors you will...