I have a new HP Touchscreen with 4 megs of ram, dual core, and windows vista 64. I load call of duty and it loads but will not run and says their is a missing dll file. from direct x. Obviously Windows vista 64 has direct x 10, and COD4 runs from Direct x 9. When I go to install direct x 9 it says that I cannot install due to another application of direct x running. HELP?