I've been using Vista since about 1 year. and since about two weeks i'm receiving a message that says "pre-released version will expire in -number- days", and i ignored it as i saw that my Vista says 'Genuine' and windows is activated. Today I received a message that my "pre-released version will expire in 0 hours". and since the 0 hours message, i'm facing a sudden restart after 1 or 2 hours of using the laptop with a "blue screen" message, i tried vista loader, but nothing happened. also the last restart the vista couldn't load and displayed the "blue screen" message,, but i solved this problem by booting from vista dvd and choosing previous restore point. any one can help please, my laptop is lenovo ibm thinkpad T61.