Hi, I installed the 20MB + of Microsoft updates this morning. Since then after every reboot I'm getting excessive CPU usage. 'Startup scanning in Progress' is the message. Scheduler has 2 instances of "Automatic startup file check" ticked, one for user logon and 1 for Successful update of the virus sigs. ekrn.exe is sitting at 50% min and peaking at 99% - it's been doing that for 3+ hours now. Multiple reboots. I've upgraded and updated to 22.214.171.124 64 bit edition (I was running 4.0.x 32-bit until about an hour ago and decided to update to the 4.2.x 643 bit eidition to see if it would make a difference, it has not). Update Module is 1031 Virus 5358 I'm currently Running Windows 7 64-bit SP1 (Beta) - fully patched as of this morning. Temporarily disabling the virus scan also fails to stop it doing this. Any suggestions?