So far, for me, I use Starter (link below) to find and remove the entry that does this. Sadly, a little research may be needed to spot which item it is since what I may note may not be your cause...
See items 6a, 6b and 6c at http://reviews.cnet.com/5208-6618-0.html?forumID=6&threadID=39326&messageID=461791&tag=
A minor annoyance. On start-up windows for System Sav (D} and Local Disk (C) pop up. I immediately X them out so no real problem but I am wondering why they started to appear so suddenly. I keep up with Microsoft Updates. Could this be the reason. Any way to keep them from popping up? Thanks.