Does SP3 self-clean?

I've just noticed that I've lost about a gb of data on my hdd. I installed SP3 on 8th of this month, and that loaded a bloated 1.7 gb. The deleted stuff this evening - 17 days after SP3 - seems to be connected to the SP3 install. There are 2726 newly deleted files with the last access date/time of the install (thanks, Recuva). Does SP3 have some sort of self-cleaning? I have run CC every few days, but not today, and it doesn't reference this at all. There's no path info. Strange.

I still have the system restore point for sp3, which is apparently a biggie. In fact I have all points since an XP reinstall in late Feb.