I seriously have no idea what to do about this problem and its very important to me since MSN Messenger is my most used form of communication! Recently I installed AVG Antivirus Free Edition on my Windows 2000 computer. All seemed fine except even more recently. Now whenever I'm on the web I repeatedly get a virus alert from AVG and a windows message saying that the file: C:\Documents and Settings\Ryan\Local Settings\Temp\THIAFB.tmp\polall1r.exe could not be copied. (I suppose blocked by AVG). Every time I get this I click "Heal" and all seems to be well. Ever since these problems, whenever I startup windows I get an error message: "Some system files are of unrecognized versions. Insert Windows 2000 CD to restore original files". It does not say which files. If I insert my CD, the message goes away - but then appears on next restart! I might be able to ignore these constant error messages except for one problem... ever since MSN Messenger doesn't work! Whenever I try to signin it says "Could not login to .NET system. Try again later". I reinstalled Messenger and it didn't help. ICQ works and the internet works... This is the only thing that doesn't. I have a router but my Messenger had been working for months previous to this problem. Other computers on the router are able to run Messenger as usual. I checked connection settings on MSN and all seem to be correct. I clicked "Connection Troubleshooter" but it keeps freezing at "Detecting network settings..." In SUMMARY - AVG seems to have somehow caused system files to change and Windows can't fix them. This has caused only one problem which is that MSN Messenger won't login to .NET system. WEIRD EH? I can't seem to figure out what to do... My HiJackThis scan is included just for kicks. CAN ANYONE HELP??? Thanks!!!!