I got a nasty virus already once this year and don't need another, even with antivirus it snuck in and I had to crash the computer and do a restore.
Even if you don't turn on your computer tomorrow, that doesn't mean you may not get it. If you have any one of the "Conficker" worms and there are numerous ones you could be at risk any time after April 1st, it still could get activated. I've done a scan, I think I'm up to date, it's been impossible to get on the Microsoft site to get the protection patch so I'm going to lockdown my firewall and when I get home from work tomorrow try to get the patch again, but I'm hoping I'm protected....even put all my pictures on a flashdrive tonight....don't want to go through a crash and restore again.