I have compaq presario 765 TU laptop. recently i formatted it. but i am unable to view dvd. its showing no video decoder installed. kindly provide me the right link for downloading video decoder. also i cant run world wide telescope. its showing install 3d graphics card. kindly give me the link for 3d effect. i have windows xp service pack 2 installed on my laptop.
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Make sure to update XP or Vista, completly. Including all service packs. In many cases that may very well solve the issue. If not, try to install the recommended driver from HP after all the updates are performed. There is a free app called Driver Cleaner on Guru3d.com and solves many driver issues.
You can choose the correct driver to clean within the driver cleaner app. Reboot after cleaning and then let windows detect the sound card/device. Windows may ask where a driver is located, choose cancel. Run your install app for the driver that you got from HP. If this does not help, I will be glad to explain on how to manually install a device driver.