|Consider disabling automatic updates for a while then taking them manually one at a time. This includes those from Windows, Java, and Flash. You should be able to disable other program updates too - often it is an option. Might be best try your AV updates first because you won't want to risk being without them for long. When you find the culprit(s) it "might" be feasible to keep it (them) on manual updates.|
I got fed up with Windows interrupting with updates, so the only auto-update I have is for my virus checker. I now get the rest, including Flash, when I want to (about once a week for non-AV security programs). With XP, most Windows updates are on the second Tuesday of the month.
Always pop back and let us know the outcome - thanks