What's the proper way to have your anti-spyware/antivirus scanners set up?

This question goes for all anti-spyware/antivirus scanners. What's the proper way to have them setup for on demand scanning with one as the main that never changes? And even then, I want to be able to disable everything if need be to install a new printer, program or what have you. If someone could point the way to a tutorial or doesn't mind pasting the information here, I'd appreciate it!

Right now I'm trying to install a new printer and trial copy of Office 2010. Instructions say to disable everything (including antivirus, spyware guards, etc). I went through the services.msc list and checked everything off, BUT can't seem to disable the Prevx CsiScanner no matter what. I like Prevx but it does seem to be a little TOO watch-doggy and there are times I just want to put it on stand-by for scans. Can someone please help with this? I already tried to install the programs without disabling CSI and it won't work. Thanks

Also, if it's impossible to disable--kinda scary thought--how do you completely remove? It's not under add/remove as it has the stealth name awhoijvd.exe and you can't even end the process in task manager (operation couldn't be completed, handle invalid).

 

Hi, you tried Safe Mode ?

 

Prevx can be temporarily disabled by right-clicking on its tray icon and choosing the appropriate option.