Open windows slow to close

Since finally getting all the Vista updates to successfully install, there
seems to be some sort of delay between clicking the X in the window bar or
using File/Close, and the window actually closing. It used to be that the
window closed instantly, while now it takes several seconds.

Rather than doing a system restore and undoing the updates, I was wondering
if there is a setting or registry entry somewhere I can use to speed the
process of closing an open window up a little.

Thanx,

Buddha