Hi winklewee, please let me know if this video card is for a notebook or desktop PC? It would also help if you list the amount of memory on the card & type of memory.
You should update the Radeon card regardless of my request above. Click this link I have posted below for a desktop PC.
Uninstall any older drivers before installing the newer drivers. ATI/AMD come's out with new drivers quit often.
For Vista 32-Bit Edition Radeon 2400 Series (PCI-e).
http://game.amd.com/us-en/drivers_catalyst.aspx?p=vista32/common-vista32
For Vista 64-Bit Edition Radeon 2400 Series (PCI-e).
http://game.amd.com/us-en/drivers_catalyst.aspx?p=vista64/common-vista64
Try the new software first & see if Vista improves. If not think about either increasing you're system memory or increasing the memory size of a new video card.
Good Luck!
Please post the results from the updated software from ATI.
Mike
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