You will need malwarebytes Anti-malware to kill this little bastage.
First, load the PC as normal. Disable system restore (right-click my comptuer, go to properties, go to system restore, turn system restore off on all drives)
Next, restart the PC in safe mode (F8 at start up, Safe Mode with Networking)
Once in safe mode, use your web browser to reach www.malwarebytes.com
Download, update, and install this software. Run a complete scan.
Let it remove any files, and restart in normal mode.
Forever more, use Mozilla Firefox for your web browsing, an router instead of a modem, a decent firewall (eg Sunbelt's free personal firewall), and a better email program than the one you're using.