I have just purchased System mechanic Professional 5 as it gave me Kapersky Personal and Kapersky Anti Hacker with it. The installation seemsed to go OK, but when I got to the part where I was trying to install the firewall which is part of the Iolo package , it was unable to transfer the firewall registration key and I got a message to uninstall and reinstall. I did this, but still no joy with the firewall registration key. The AV seems to be working OK and the AntiHacker also seems OK. I rebooted as instructed but I have now got the following message twice: " Windows-Delayed write failed. Windows was unable to save all the data for the file: C:\Windows\system 32\drivers\pxfsf.sys:KAVICHS.The data has been lost" I have done a scannow, but nothing came up. I really do not know what to do. I have XP home and my PC has been running fine. I did have Avast AV and ZoneAlarm firewall, which I uninstalled before installing Kapersky. I am now worried that the Kapersky AV and anti hacker are insufficient protection without a firewall. I deliberately bought the CD Rom version of System Mechanic, rather than just the download. I am really disappointed and wonder if anyone can advise me what to do about the above error and whether it is critically important.