I am getting particular virus popup message please help….

Hi.
I am using windows vista business edition. I am getting a particular virus Popup message that is in the picture.
If i click on the ok button it will Popup downloading one 'ieav.exe' application.
This is happening all the times i am opening the IE , folders,etc…
I have done the full system scan with my avira antivirus and also scanned with the windows defender.
But nothing is helping me to resolve this issue. I am not able to repair my IE.
please help me….
System Error!
Attention, arul! Some dangerous trojan horses detected in your system.
Windows Vista (TM) Business files corrupted.
This may lead to the destruction of important files in C:Windows.
Download protection software now!
Click OK to download the antispyware. (Recommended)
