I am new to the forum but I still need some advice. I am somewhat OK with PC but certainly not a programmer or analyst. Problem error message on screen:
Microsoft visual C++ runtime library (in title bar)
buffer overrun detected!
Program: C:\windows\explorer.exe
buffer overrun detected which has corrupted program's internal state.

Close IE and restart, scan your PC for virus, spyware, install a firewall software like zonealarm.

You'll no doubt be encouraged if more than one response gives the same advice.

The AVG anti-spyware clears this up (if trojan it be) but it'd be as well to run SpyBot as well to double check. Not all trojans disappear on first pass in which case no doubt you'll be back to the forum.