After doing an ACI Web update to pick up the 1004MC March 2009 revision, I have had frequent problems accessing Internet Explorer on my WindowsXP operating system computer. Checking system restore, I noted an entry on the exact web update day that shows "2006 SP5 Updates Setup". That is ACI. Not sure if all this is related, but I have run System Mechanic full scan, virus scans and a system restore, but I still have frequent Internet Explorer lockups. I can access the internet via web maps, MLS, Flood Maps, etc. but have trouble with Explorer about 50% of the time. Any thoughts or similar problems out there? I tried a fresh Web Update to no avail. Thank you for your thoughts on this.