Go to start -> run and type in dxdiag. Hit enter.
On the direct X diagnostic thing, click on the video tab. Note down the card name and the manufacturer name. Click on sound, again take a note of the manufacturer and card name.
Open up google and type in the manufacturer and model of the graphics card, plus the word driver. Look for the latest available, preferrably from the manufacturer's website. Same deal with the Soundcard.
You might also want to download and reinstall Direct X from Microsoft's site, just to make sure you've got the latest version of 9.0c
If by 'rinsed and deleted' you mean re-installed Windows then look for other programs running too. If you've got an OEM version, then it's probably got a lot of adware crap from AOL and the like which you'd removed last time.