15 years ago
The guest account doesn't have a password, right?
Now, shut down. I'm assuming you're on Windows XP.
When you press the power button and it begins to start up, press F8 repeatedly. This will take you into safe-mode, where you can change your administrator account so that it does not need a password.
After you press F8, sometimes (can't remember well) it'll take you to a black screen with four different options:
-Start in Safe Mode
-Start in safe mode w/Networking
-Start in safe mode w/something else I can't remember
-Start Windows Normally
You want to select Start in Safe Mode. It'll take some time before Safe Mode starts up, but when it does, I want you to go to 'Start', then go to 'Control Panel' then 'User Accounts', and then change your Admin account so that it doesn't need a password. Then, restart as normal, and you should be able to get onto your comp.