My computer downloaded Windows Police Pro virus that seemed to have come with Comcast Internet Service. I thought I got rid of it by searching and deleting. It locked my system restore as well as add/remove programs in the Control Panel. But it was operable a little. Within a week's time, my electricity was off for about a week and a half and when it was restored, I turned on the computer, went to internet. Security Tool totally took over the computer and I could not click anything. So I again went in safe mode and starting deleting. I finally got McAfee to do a scan and the files it found to be corrupted gave me an option of deleting or ignoring and I think I deleted an important system file. Now I get error messages c:\WINDOWS\system 32\Restore\rstrui.exe is not a valid WIN 32 application and same for back up c:\WINDOWS\system 32\nt backup.exe is not a valid WIN 32 application.
Bottom line, the virus is now in my internet files so when I go on the internet Windows Police Pro takes over unless I am in safe mode with networking. I am now on the internet as Administrator and not my personal user logon in safe mode with networking.
So please help because I am ignorant of what to do next.