David... you have 3 options with your PC:
1) Take it to a PC repair place... and have them try to repair/replace the missing files and wipe out the virus so you can be up and running without losing data (this will cost money)
2) Take it to a PC repair place... have them pull all the files you want to keep off of the drive, then reset it back to factory... then reload all your programs and saved files (this will also cost money)
or...
3) Your PC should have come with a factory restoral disc. Put it in the CD drive, and follow the instructions to reset it back to factory and reload windows. This will wipe out all your files, data, and programs. It will be like it was the day you bought it. You will then have to reload all the programs you want to use (Aces High for example)... But this option is totally free. It will just cost you a lot of time.