If it just started happening (and you have Windows XP), take a look at your system restore points to see what's changed. Could be you installed something/removed something that started causing the problem.
Go to "Start"->programs->access.->sys. tools->system restore
Then select "restore to earlier time" and hit next, then click on each of your restore points on the little calendar, noting what changes might have occured. If you see any obvious items, like, "Removed patch for IE" or something, then try rolling back to that version.