Vista SP@ aswsp.sys BSOD error

I am facing new error with aswsp.sys error in BSOD with driver_IRql_less_than...

I have fully updated Avast,Malwarebytes and K9.

Please help.

I am facing new problem when updating Vista.After rebooting I find that the transparency is gone and replaced by XP grey taskbar and menu.When I go to themes in persanalize,neither Vista Aero nor vista basic is there only black in preview small screen.
It says vistual styles cant be applied.

Plz help asap.

It looks like the problem is with Avast Anti Virus
Use the uninstall to to uninstall
avast! Uninstall Utility
Replace with Microsoft Security Essentials and
the free Malwarebytes for a once a week scan