My computer has just started alt-tabbing automatically. It doesn't matter if I have only one window open or more. Has anyone faced this problem and if so how can it be fixed?

What is it exactly that you see? Does your system show the overview of running applications or do applications just jump in the front without a reason?This can be an issue with your keyboard or mouse. Maybe accessibility options (sticky keys) turned on by accident. I have not seen reports of malware doing this on Windows 7.Ray

I used to get aps jumping in front a lot but I changed the batteries in my wireless mouse and it went away??? Now I get EXPLORER left pane randomly jumping to folders without touching anything. I think it's kinda cute. Like having a ghost(remote access paranoia).

It still sounds like an issue with input devices to me. Can you give another keyboard/mouse a try for a while to see if the strange behavior stops?Maybe just unplug the keyboard and mouse to see if Explorer continues to jump to random folders if you don't have a spare keyboard lying around.Ray