Windows Explorer slow

Hi all,
I run Kasperskey Antivirus and Sygate Firewall on Windows XP Pro. My windows explorer has behaving peculiarly lately: it takes a good 3 seconds to load when I double click a folder to browse to. The cursor just turns into the full hourglass and I'm stuck waiting between browsing folders. It gets very irritating when I'm trying to get more than 4 folders deep somewhere. I'm positive that it used to be faster, but I can't remember when it specifically became slow. Short of repairing/reinstalling XP, how might I fix this?

Also: I'll note that when I use third party file browsing software, the speeds are perfectly fine. Folders load instantly.