Hi,
first of all, scan your computer with good antivirus and antimalware software (if you haven't already done so). I recommend free Avira, free Malwarebytes', and free SUPERAntiSpyware.
Always worth it to do a virus scan in safe mode (repeatedly tap F8 on startup while there is still black screen, then you will be offered to select a boot mode. Select Safe Mode). Do a scan, hopefully get rid of the problem, reboot and tap F8 again, select normal mode.
If the program is still in the add/remove list, try an uninstaller, like free Revo. Hopefully you'll get rid of that unwanted program.
You might also want to cleanup the registry to remove any leftovers. Backup the registry first (usually registry cleaners offer you to backup, or you can create a system restore). CCleaner and Auslogics Registry Cleaner (both free) are very good.