Hello TechSpot users. Before i dive in to the substance of the matter i feel it's obligatory that i point out how inspiring the work you guys do here is and how much i hope you keep on keeping on! As for the thorn(s) that drove me to sign up here i wish you and your masters a good riddance. It all began when my main motherboard fried. Yanked my USB out, PC shut down, never to see the light again. Board went dead. Fine no problem i have a spare OptiPlex GX620 in the basement. Disconnected the dead corpse, hooked up the GX620 and installed an XP SP2 Dell CD i've had from a past machine. Everything went through smoothly. Installed the recommended drivers (in the correct order!), AVG Internet Security, Spybot S&D, and other convenient software like MS Office etc. All this was done offline also. I proceed to reboot as required by the driver installations. The system restarted, i plugged in my network card, and began to browse the internet to DL other miscellaneous software, namely Firefox, mIRC etc. Everythin was fine up until the point where AVG began reporting some "Win32/Heur" virus detection in my windows folder, randomly spitting out "infected" files like rundll32, regsvr.dll and other native /windows/ files that i knew weren't problematic based on all that i mentioned before. I decided to ignore this and kept on browsing the internet via IE. I found mIRC and dl'd it to my Local C drive with no drama. However, when i come to open the installed mirc.exe the hour glass flashes for a quick second and nothing happens after that. I proceeded into a clicking frenzy for approximately 1minute to no avail. I cycled through everything from attempting to run it from a USB stick to creating a second account and running from there with no success. However, by some luck i found myself right-clicking the exe and choosing the "Run as.." option and ran it under "Current user." End result: the thing opened (even though it kinda froze for a few seconds post-loading). Of course, this puzzled me for a good while. To the point where it led me to think that troubleshooting was a waste of my time! Heh, of course i recovered from this temporary takeover. In a nutshell these are my main concerns. As sidenotes however, i'd like to add that: 1) i have two occurrences of Notepad.exe and explorer.exe (One set in c:\windows and the other in c:\windows\system32) 2) AVG seldomly detects a Trojan Horse Gen "virus" 3) When i click "System" in the Control Panel i'd get an error dialog with accompanying message along the lines of: "Windows cannot find C:\windows\system32\rundll32.exe. Make sure you typed the blagh blagh" you get the point. 4) Also AVG tends to be regarding every little thing i do with malicious content now. For example it'll pick up my printer's drivers as virus @___@ My System Specs. are as follows: OS Name: Microsoft Windows XP Professional Version: 5.1.2600 Service Pack 2 Build 2600 System Type: X86-based PC System Model OptiPlex GX620 Processor x86 Family 15 Model 4 Stepping 7 GenuineIntel ~2660 Mhz BIOS Version/Date Dell Inc. A11, 11/30/2006 SMBIOS Version 2.3 Total Physical Memory 512.00 MB All input greatly appreciated guys!