Now they (India guys)want me to do another reinstall but dump Quicktime first.
A complete format and reload would definately solve the problem but that is the easy way out, lets see whether your video card/drivers are causing this problem.
Open device manager and go to the properties of your display adapter, click on the driver TAB and then click Roll back driver. Once finished you may have to restart your PC. Then check your software and see if it works.
Alternatively does your PC have an onboard VGA card? If it does then remove your geforce card and boot up using the onboard, once the drivers install try to use your programs and see if they work.