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If you think you've been hacked, then the very first thing you should do is turn off/disable your wireless or any network connection. If there's no connection to the Internet, then there's no way for them to connect to your machine so you've reduced their chances of doing any further damage.
After that, run a virus scan and malware check. See what it cleans off. If you're adventurous, just blow away and reinstall the OS. That way, there's no chance of any traces of whatever malicious software being left behind to wreak further havoc.
You can't do anything about what's already been done. You just have to prevent any further attempts to access your machine.
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