I just had the oddest thing - endpoint antivirus failed to update - twice - it complained that it was unable to allocate memory, while task manager showed on 5Gb of 8Gb of physical memory was allocated... I quit all firefox windows (the biggest memory hog) - and tried again - same problem. Rebooting fixed the problem, but I can't expect users to reboot every couple of days - they just DON'T DO IT... Here is the post reboot info: Virus signature database: 7224 (20120615) Update module: 1041 (20120430) Antivirus and antispyware scanner module: 1357 (20120510) Advanced heuristics module: 1121 (2011120 Archive support module: 1146 (20120511) Cleaner module: 1056 (20120601) Anti-Stealth support module: 1030 (20120322) ESET SysInspector module: 1224 (20120223) Self-defense support module: 1018 (20100812) Real-time file system protection module: 1006 (20110921) Translation support module: 1064P (20120427) HIPS support module: 1047P (20120419) Internet protection module: 1035 (20120323) Database module: 1019 (20120404) "Events" log: 6/15/2012 9:14:30 AM ESET Kernel Virus signature database successfully updated to version 7224 (20120615). 6/15/2012 6:59:57 AM Update module Error downloading file from update server NT AUTHORITY\SYSTEM 6/15/2012 4:50:20 AM Update module Error downloading file from update server NT AUTHORITY\SYSTEM 6/14/2012 10:50:25 AM ESET Kernel Virus signature database successfully updated to version 7222 (20120614). the machine is Windows 7 ultimate x64 - new built less than 2 weeks ago - up to date with windows updates and basically just running office, firefox and eset protection.