2 days ago my computer did an UPDATE and it came on perfectly. Then yesterday I was on the sims 2 then it had an unexpected error came up and it went off I turned it back on and it worked perfectly again then I went back on to the sims 2 and it happened again but this time I turned it on it went to the screen with safe MODE and stuff like usual    then I clicked start normally it went to the load up screen but thiss time it didn't show my log up screen so i waited for lyk 10 mintues and started it again and TRIED safe mode but i cant do anything I'm on the internet on safe mode networking but i cant listen too music or watch videos or anything and I need help. Before anyone asks I dont have a disc for my vista program and I need help and i reallyy need it  So helpp mee NOW! if yhuu no!1. Create Vista Recovery Disc.

Option 1:
http://www.c4consulting.com.au/soluctions/vista/VISTA%20SOLUCTIONS.htm

Option 2:
Download Vista Recovery Disc iso image: http://neosmart.net/blog/2008/windows-vista-recovery-disc-download/
Burn it to CD, or DVD: http://neosmart.net/wiki/display/G/Burning+ISO+Images+to+a+CD+or+DVD

2. Boot from created disk.
At first screen click on Repair your computer:

This will bring you to a new screen where the repair process will look for all Windows Vista installations on your computer. When done you will be presented with the System Recovery Options dialog box:

After this, it will present you with a LIST of options including startup repair, system RESTORE and command prompt:

Try System Restore, first.
If that doesn't work, try Startup Repair.