Hi,
I just got a new rig with my original old harddrive installed.
win 7 64
Tried to boot up, but got BSOD. 0x0000007B
Tried Safe mode, stopped loading at aswrvrt.sys.
I have attached my FRST.txt.
Please help! Thanks!
OK.
It seems I have solved the problem my self. It was just a drive letter problem. I put my usb drive in, then plugged in my 2nd harddrive in, boot it up, everything went normal again. Not avast’s fault I believe. Just win7 cant boot up with different drive letter.
Time to install some new drivers for my new rig 
thanks all!