I think I am hacked!?

So my PC has been really weird today. The mouse moves on its own, webcam turns on for no reason, and disc tray ejects on its own. My friend told me it might be a virus so I scanned my PC and found 3 Backdoor trojans. I deleted them and thought I was safe but it happened again. I scanned again and found one of those... show more So my PC has been really weird today. The mouse moves on its own, webcam turns on for no reason, and disc tray ejects on its own. My friend told me it might be a virus so I scanned my PC and found 3 Backdoor trojans. I deleted them and thought I was safe but it happened again. I scanned again and found one of those trojans I already deleted. I'm running Windows 7 and my anti-virus is AVG. I turned off remote assistance because I heard that hackers can't do anything with it turned off. Anyway please help!
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