Just so it is known i found out the reason too this error...
its a virus called Win32.Parite that attacks exe files and bounces from one too another infecting everything. once you remove this virus all is well and original bots just worked.
here is a very good tool (and its free
) i used it, it helped alot:
http://www.bitdefender.com/site/Down...movalTool/136/
good luck
