AvastUI cannot read memory at 0x7600ee1f

Hi,
I am using Windows 8.1 preview version OS, 64bit and having 4GB of RAM. Although I have been using Avast which is installed in my PC for a couple of years now, recently it’s come up with a major problem and gives me the error “The instruction at 0x7600ee1freferenced memory at 0x004589ff. The Memory could not be read”. I am suspecting it’s something to do with the operating system itself but not quite sure. I tried to recover my system and did a fresh install. I also tried uninstalling Avast and re-installing but of no joy. Anyone have similar problem or can help please respond. Many thanks.

The instruction at 0x7600ee1f referenced memory at 0x004589ff. The Memory could not be read. – Click on OK to terminate the program
