Installed SP2 (XP) today - Already have a firewall (question)

I notice that the Windows firewall is turned on (I previously had this
turned off since I am running Zone Alarm Pro). I presume I can safely turn
this back off. I'm noting alot of issues since installation this morning.
1) My Exec Software Diskeeper has frozen.
2) My popup blocker has disabled a few more features than ZA already blocked
a) I tried to register on a site and they used the "type in the numbers
in this picture" technique which may use popup technology. The picture
refused to display and I was unable to register.
3) My pages seem to load very slowly. I am on a DSL and am accustomed to
fast loads. It may be the defragger... can't tell just yet.
4) I really like the v5 Windows Updater. This is a great feature!

This is all I have so far.

Jamie