You need the Updates for performance reasons and to fortify your firewall against invaders. Install them in small groups to isolate the group with any problem Update, then one-by-one until you find the Update, start a support e-mail case on Windows Update website.

Your bluescreen should have generated a bugcheck file. Use this tool to upload it to the Crashes and Debugging forum here for analysis so you'll know the exact cause: Blue Screen of Death (BSOD) Posting Instructions - Windows 7 Forums