I personally wouldn't recommend disabling the updates completely. Saying that, I have Vista on both my desktop machines, all fully updated, and haven't had any problems with my burners.
However, if you really want to disable Vista's updates, then go to Control Panel -> Windows Update.
On the left, you'll see a list of links (Check for updates, change settings etc).
"Change Settings" is the option you want - click that, and choose how you want your updates. The is an option in the drop-down menu which says "Never install updates". Choose that one.
A happy medium IMO, would be to choose "Check for updates, but let me choose whether to download/install them".
You might also want to investigate that it's not another piece of software causing it (it's a change to the upper and/or lower filters in the Registry that's the problem).