Explorer Problems

I've been having a problem that I associated with IE7, but it might actually
be with Windows Explorer.

It takes up to 3 minutes for the box to come up when I add a Favorite in
IE7. This usually only occurs when I haven't been on the computer for awhile
(I keep it running) and it gradually gets faster, getting down to 30 seconds
and, in rare cases, one second. (It always took one second or less with IE6.)

I've also noticed that the Created date gets updated when I click on the
shortcut and sometimes the date gets updated without me even clicking on it
(i.e., I sort by date and a shortcut shows up at the top that I haven't
viewed in some time).

Has anyone else experienced these anomalies?

I'm running Windows XP SP2.

Bob