Yahoo password problems

Hello. I dont know if this is the right place, but it was the best forum I could find.
My yahoo accounts are all messed up. About every 2 minutes, the password changes to something probably randomly generated (3 letters-4 numbers-3 letters-4 numbers). It only seems to change when I am on a certain computer. Is this a virus? Its annoying cuz every time I try to sign in i have to go to the "oh you forgot your password" page and it takes awhile. Its really P icing me off. Well thanx

If your password is changing then someone is changing it. Scan your compter with antivirus and antispyware after updating the definition files.
Also, when you change your password back, don't use the same password you used before.