Windows 7 hangs at aswRvrt.sys

Hi-I have seen a number of similar posts about this and was hoping someone could help me out.

When I start Windows it hangs at the starting windows screen. I have tried to repair using the windows cd but I just get stuck on an empty blue screen. I have also tried to repair from the advanced boot options. I have tried to boot in safe mode and command prompt and both boots stall at aswRvrt.sys. Can I make a log if the windows startup repair isn’t working?

Previous to the computer not working I do not believe I installed any updates or changes however I have a lot of updates set to automatic.

I have windows 7 64bit installed with Avast internet security.