Hi, what has happened is when you installed the Win 7, it hasn't recognized your Video card, what you need to do, is obtain a driver that is suitable for Win 7. You need to go to the manufacturers website of you Video card,or PC, and find the driver and download and install. If it is an ATI card go to the ATI website and download the latest driver for your video card, if NVIDIA then the same applies here, BOTH of those sites would have a suitable driver, IF the card is supported under Win 7.
Many Video cards are NOT suitable NOR supported, in this case you either have to use the "Generic" drivers Win 7 supplies, or change you Video card if possible.
I have a feeling that your PC will NOT be suitable for Win 7. However I include the link for your drivers. Please go to this website below and download your Video Drivers and see how you go.
http://www-307.ibm.com/pc/support/site.wss/migr-50535.html
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