Did a fresh install of Windows 7 64bit Home Premium about a week ago, and it's been running great except that every time I try to install Antivirus software, my boot time increases dramatically and occasionally Windows will stall at the Welcome screen, after password input, with just the loading circle spinning in an endless loop until hard reset. When Windows does load, it takes ages for my icons & gadgets to pop up. With no AV installed, my boot time is awesomely fast, and nary a crash at the Welcome screen.
First noticed this after installing free AV software that comes with a Time Warner subscription (CA Antivirus). Uninstalled CA and bought a fresh copy of Norton 360 and I'm still seeing the same sluggish boot times. Once I get into Windows, all is well. Windows Defender is turned off, however Windows Firewall is still on and seems to be working in tandem with Norton's firewall.
Any advice on the issue would be greatly appreciated. Thanks for reading.