My Windows 7 Computer keeps switching user and tries to log back in with old password

[MadFrosty]

My Windows 7 Computer keeps switching user but then tries to log in with an old password all by itself, i can watch it do it and this makes me unable to play games with log in requirements. Ive tried a couple of things and it doesnt seem to be anything with the Hard Drive, Motherboard, Power Settings or viruses, atleast Avast, MalwareBytes and MSE are unable to find anything. Please do help me.

Will provide more information if needed.

 

[USAFRet]

keeps switching user but then tries to log in with an old password all by itself

An actual old password? Or just a password attempt?
I'd venture to think that you've had a keylogger, and some sort of remote connection.

i can watch it do it

Blow away that current installation and start fresh.

 

[MadFrosty]

It was my password when the problem occured but i changed it so it cant log on. after some research i found out that it might be a worm that tries to infect my computer. as i stated, i cant find anything with anti malware softwares