From locking an uninstallation routine of another program, to preventing ATI Tray Tools profile shortcuts from functioning, I've now discovered that Kerio is causing XP to slow to a crawl when trying to change XP's colour scheme.
For example, it takes about 30 seconds to change from Olive Green to Silver. The screen slowly fades to grey the fails to respond for a while unless I Ctrl-A-D. If I close Kerio, the the scheme changes over in an instant.
I simply can't find any function within Kerio that could be causing all this! Anybody else know why this is happening?