Hi",)
Windows XP Professional SP2
Also I have to mention that this issue happens not after each time Windows starts. If I reboot PC, it gets alright. But next time the same story repeats.
Try this simple Steps:
-Uninstall CIS
-Perform DISK CLEANUP (then restart)
-CHECKDISK your HARD DRIVE
-Restart again after Checkdisk is done
and Install Fresh copy of CIS

[Windows FIREWALL is TURNED-OFF anyway?]