MechBgon, et al, I had to uninstall KIS 7 (or maybe it was 8) because the XP's feature fast user switching suddenly became exceedingly slow and would eventually bring my Q6600/4GB XPSP2 system to a halt. Maybe a signature or program update introduced the problem, as it did not exist previously.
Numerous people reported the same thing, even on Kaspersky's support forums. I found that disabling KIS solved the issue, but having no AV protection is another issue. I installed AntiVir Personal, but it offers no spyware protection (I later came to understand) in that version. Under AntiVir, the problem FUS issue did not return.
Some have reported that the issue remains in KIS9. What are your results performing FUS with KIS9?
Thanks.