|"keeps asking me for the password to another account which is not mine"|
What is causing this, is the main question.
Download OTL, save & run from your Desktop. If your default download location is not the Desktop, drag it out of it's location onto the Desktop.
Double click the OTL icon to start the tool. (Note: If you are running on Vista or Windows 7 accept UAC alert)
1: When the window appears, underneath Output at the top, make sure Standard output is selected.
2: Select Scan all users
3: Change Drivers to All
4: Under the Extra Registry section, check Use SafeList
5: In the lower right corner, checkmark "LOP Check" and checkmark "Purity Check".
6: Click Run Scan and let the program run uninterrupted.
Screenshots ( SS ) of 1 - 6
When the scan is complete, two text files will be created on your Desktop
OTL.Txt <- this one will be opened
Extras.txt <- this one will be minimized
The logs are large, upload them using this, or upload to a site of your choosing. No account needed. Give us the links please.