Hello Everyone, I have been having a play with the latest version of Malware Defender for a few weeks now, having used SSM for many years I think its time to look for an alternative classical HIPS for my XP setup. However, testing MD on a clean, freshly installed image of XP Pro SP3 with latest MS updates and with no security software installed I have found that even with rules created in learning mode I am unable to perform a chkdsk operation on the system drive of my PC. Subsequently removing MD and rebooting the PC allows the chkdsk operation to perform successfully. I would assume that learning mode would create the necessary rules automatically for the chkdsk function to take place, but on this fresh image this is not happening. The MD and system logs do not appear to show the reason why chkdsk is not working. I have a second internal HD also on the PC which is able to do the chkdsk function successfully on a reboot with MD installed. Even disabling all the real-time protection modules does not solve the problem; only when MD is removed will the chkdsk commence. If anyone who is a long term user of MD can offer any suggestions I would appreciate any advice or help you can offer. Thank you in advance.