Is there an issue running SP1 (IR4) and Avast Internet Security? As soon as my computer starts up, I get an NWPOPUP message window on the screen and my computer beeps furiously. If I uninstall Avast, I can logon to my network no problem. If I disable Avast I still get the same popup screen. If I uninstall the SP1 client and leave Avast running, I can run my computer no problem.