Avast 4.1 Home won't update

Every time I connect I’ve been getting a message saying the Avast server is down. The last vius update was 14/6/04. When I click to update the virus files or program nothing happens. The website says latest iAVS are 17/6/04. Downloaded it but cannot install, it always says Installer program is currently used by another process. When I click Stop On Access Protection & Exit I still get the same error message.

I found this in the FAQ but cannot do the recommended fix. Every time I go Settings>Update (Basic)>Details the program hangs, is reported as Not Responding and I have to End Task to exit.

What operating system do you have?
Check the list of running processes before going to the “Details” dialog - and if you find avast.setup on the list, kill it first.