AVG and Internet Explorer problem..

Hi All,

1.
Did anyone familiar with AVG anti-virus?i have face a problem, my pc was attack by virus call trojan horse Generic3.HYR, so i download the AVG and install to my pc,then i run scan computer. After scan complete the AVG was found a file call pagefile.exe in my c:, the AVG direct delete the file which kill the virus.But the problem is when i double click the c: in "my computer" it pop-up a screen ask me open with...
So, can anyone help me how to fix it so that i can double click the c: and go inside.Now i using right click and click open to go inside my c: drive.
2.
another problem is my internet explorer got problem which everytime i click IE and the IE automatically go to got virus web page,i have change the default web address to yahoo.com but it still go to this web address http://www.d766.com which content virus web site,so anyone can teach me to slove this problem.

All this thing really make me trouble,hope you all can help me,thanks.