I think my computer has been hacked, help please?

Hi,
A couple of days a go, after having my laptop for nearly two years, I have started to have major issues with it. When I log on, as soon as I get on to my desktop, without any encouragement, it starts doing its own thing such as the mouse moving around in a very jagged manner and generally resisting anything I attempt to do. It is making my computer incredably slow and its so frustrating. Even worse, I am frightened I may have picked up something and that someone is controlling my machine but the issue is I know so very little about computers, any advice would be greatly appreciated.
I have changed browsers (used to use Safari, now I use FireFox) and have backed up all my files on to a hard drive and am thinking about restoring the mac to it's factory settings but I am unsure whether this would mean I would lose all my applications which I desperately can't afford to do. It only happens occasionally, so at the present it is fine but it occurs out of the blue and is very unnerving. I have two anti virus programmes on here: ClamXav and iAntiVirus which suggest that there are no virus found on the computer. I have also been monitoring the activity monitor and although nothing has particularly drawn much attention, it can be fair to say I am not entirely sure what I am looking for.
Is there any way to double check to see as to whether my computer is infected and if so what would be my next move?
Muchly appreciated

The anti-virus software is not the problem.  Yes, Shootist is correct that AV software can be almost as much of a problem as getting infected with malware, but ClamXav is one that is good.  Having two isn't so good, though, so ditch iAntivirus at least.  And see my Mac Malware Guide for more information to protect yourself from malware.
Similarly, the firewall is also not the problem.  You almost certainly do not need a firewall.  See Do I need a firewall? for more information on that.
Most likely, you are not being hacked.  If I understand you correctly, it doesn't seem like the mouse has any purpose to its actions - is that correct?  If so, my first thought would be that your battery has gone bad and is expanding, and in the process is pressing on the underside of the trackpad.  That is a known cause of this kind of behavior.  Though I must admit I've never seen a battery expand, it does happen.  I'd advise getting the machine looked at by Apple ASAP.
If the movements do appear purposeful, someone could be playing a prank on you.  Check System Preferences -> Sharing and make sure everything there is turned off.  If Screen Sharing is on, someone may have been using that to access your machine, most likely someone who knows your MobileMe password (if you have MobileMe) or someone on the same local network that you're using.
(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

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    Click " Like " if you want to Thank someone.
    If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.
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