Installed Norton Internet Security 2011 now Windows will not boot

I recently purchased Norton Internet Security 2011 for XP/Vista/7 from PC World and after installation windows refused to boot back up.

It was working perfectly ok before the install.

The only information I have on the computer is:

 

WINDOWS VISTA HOME PREMIUM

 

PACKARD BELL

MODEL NAME:  ISTART B2214
TYPE REF:        CHOP-D10
MOD NUM:        DV100
P/N                     PB82128401
CPU:                 INTEL CELERON DUAL CORE
GFX:                  NVIDIA

 

As stated before, there were no problems until the install and now I'm left with a black screen.

It never came with a windows disk, but I have a full copy of windows XP to install if I can't find a solution.

Any help would be appreciated thanks