DJ'ing with Anti-virus on

Guys, I've just finished installing Microsoft Security Essentials Anti-virus on all 3 of my home computers (2 PC's and 1Netbook) and to be honest I quite pleased with it. The anti-virus seems like it's not a CPU hog like some other anti-virus' I can mention
Now, I'm in a Dilemma. Although I very rarely go online with my gig laptop, (I only online to get updates for my OS). I'm thinking of installing Microsoft Security Essentials on my gig laptop too. For the added protection when I do go online
I know I can always manually turn the anti-virus on and off on the start up tab of msconfig before I DJ ( this can be a bit of a ball ache though ), but do any of you guys DJ with AV on and have positive results?

Now, I'm in a Dilemma. Although I very rarely go online with my gig laptop, (I only online to get updates for my OS). I'm thinking of installing Microsoft Security Essentials on my gig laptop too. For the added protection when I do go online
I know I can always manually turn the anti-virus on and off on the start up tab of msconfig before I DJ ( this can be a bit of a ball ache though ), but do any of you guys DJ with AV on and have positive results?