I have found that eratic driver problems with both sound and graphics could be related to the fact that MS Vista does not update key drivers once the OS is installed and all pacthes have been applied.
I Have MS Home Vista Premium Upgrade 32Bit from Windows XP SP2.
These are the drivers I had to check individually to make sure they were upto date:-
1 - IDE Controller Drivers (Intel® 82801FBM Ultra ATA Storage Controllers - 2653)
After going to device manager and right clicking on each and 'Update Specific Driver'. I reboot the machine and my sound and graphics both increased with no crackling from the sound and the graphics while not as fast as Windows XP was within 2-5fps of XP.
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