Avast can't update

Hello… I need help from all of you.

I’m using Avast free with current version 7.0.1489 installed on win 7. My problem is avast can’t update since 20/05/13. Today, I’ve tried to update manually but still can’t do. Then, i’ve tried to uninstall the program, still can’t do too. When I’ve tried to update manually and uninstall there was a notification like this " the exception unknown software exception (0xc0000417) occured in the application at location 0x003a8aac." or others notification like this " the exception unknown software exception (0xc0000417) occured in the application at location 0x01298aac."

Please help me, i need to fix this error asap… Thanks…

why avast 7. ?

to uninstall. http://www.avast.com/uninstall-utility
install avast 8. http://www.avast.com/download-software

Thanks. I’m trying now.