|First of all you must enable Windows task manager (if it is disabled). How to do this:|
Then Open task manager and terminate the following processes:
1) Windows Antivirus Pro.exe
2) svchast.exe (not svchost.exe)
Now you should be able to remove rest of Windows Antivirus Pro files. Detailed manual removal guide:
There is an automatic Windows Antivirus Pro removal tool at the same website.