can you boot into safe mode? try that: To start the computer in safe mode
When you see the message Please select the operating system to start, press F8.
Use the arrow keys to highlight the appropriate safe mode option, and then press ENTER. Try login and removing the program there. You can also run system restore from safe mode:
To run System Restore in safe mode
Access System Restore through Help and Support.
Follow the instructions on your screen.
To access the System Restore Wizard, click Start, and then click Help and Support. Click Performance and Maintenance, click Using System Restore to undo changes, and then click Run the System Restore Wizard.
While the computer is in safe mode, System Restore does not create any restore points. Therefore, you cannot undo a restoration that you performed when the computer was in safe mode.
You can use System Restore to restore your computer to any restore point while in safe mode. If you cannot start the computer in standard mode, you can use System Restore to restore to a time when you could start the computer without errors.
To restore to a time when your computer started without errors, select a restore point as close to the time you remember it last started without errors.
If System Restore is suspended because of insufficient disk space, you cannot enable it by making more disk space available while in safe mode. You must restart the computer in standard mode and make more disk space available.