Menu and Scrolling Bug? Please help?

I own an Aspire 8735G Laptop with Windows 7 64 bit.
I have had the laptop for barely 3 weeks and the following has started to occur

(Sorry if this is not the right place in the forum to go)

The menu's within Windows do not allow me to scroll through them. As an example, in the Power Saving window, when I click on the drop down menu to change the amount of time I want my laptop to switch off or dim, the options quickly count down from the point where I click it to 1 minute. It does this everytime.
What's worse is that it was only the Power Save Options that did this to start with. But now is spreading to practically any window of options within Windows, not allowing me to change or alter anything. The only way to ensure nothing it does is saved, I cancel the window.
This is also affecting the scroll bar on some windows. I cannot scroll to the bottom of a page as it just pings back to the top again.

Thankyou in advance for any help at all.

Stuart

Uninstall your antivirus to test.

If you have AVG, that is most definitely the cause. Uninstall that. Disabling will have no beneficial effect.

Great thankyou...will try that.

Excellent! That works a treat.

Thankyou very much!

You're welcome. So, did you have AVG or was it another?

(AVG is the worst scourge of the net. You don't want to know how many pcs I fixed in the last week alone with it. I'll tell ya anyway - at least 50.)

Oh my god! No no no...

It's come back again

It was McAfree's that I had. I uninstalled it and replaced it with Avast. Everything was fine upon restarting and now it's all back to where it was.
I restarted again because I had installed the latest RealTek sound driver from this site. I know it's unlikely it isn't that that would have caused it to return but there is something else I have noticed, I use Google Chrome browser and I can access the menu's, the menu's wont drop down and I cannot right click on menu's either. Is there a connection?
Could Avast also have a problem with this? If so, surely there's antivirus out there that wouldn't mess with my system.
Or could it be something else?

Sorry for all the questions, I've just gone from happy chappy to annoyed chappy

Uninstall Avast to test. As for other antivirus, I use Kaspersky built into ZoneAlarm Pro Extreme and really can't speak of others.

Ok...uninstalled Avast and checked...still the same problem.

Any other ideas? :) (...would be much appreciated)