[Pinga]

By reloaded I mean loading windows from scratch and making it like brand new. Which antivirus program(s) did you scan with?

This guy used your password from another computer. There's a few ways he could do this.

a) He guessed it (not too likely since you claim it's a decent password)

b) Brute force - he tried many passwords until one worked (not too likely as party should lock your account)

c) He hacked your computer and installed something that sent your keystrokes to him. (somewhat likely)

d) You used the same user name/password on another site that he has control over (I think you already said you didn't do this)

e) He hacked party poker's database and has access to millions of passwords (Less likely but possible)

f) He hacked party's computers and added some custom code to the party application so he can either gather passwords and/or control your computer (again not so likely but possible)

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If we assume (c), this program may still be on your computer. This would help us find and identify it but it would also be very bad for you. Any account you access will be at risk. Changing your passwords won't help if the bad guys sees the new ones as you type them.