There's a nasty new rogue going around called Smart Defender Pro. A number of good free tools will remove it, including SUPERAntiSpyware.
SUPERAntiSpyware has updated its definitions to detect and remove all traces of this rogue.
Download SUPERAntiSpyware from
www.superantispyware.com.
Run the install.exe file.
Select “Scan Your Computer.”
Select “Perform Complete Scan.”
Follow the prompts to quarantine/remove the infected files.
Make sure to reboot following the scan.
If you are currently running a copy of SUPERAntiSpyware Professional, update the latest version/definition before running a scan and completing the quarantine/removal process.