Vista home premium French & English

Hello,

i have a problem with my pc hp vista home premium
i can't swith it on anymore

when i stared it a window apear
- lunch startup repair
- start windows normally
since i don't have CD install i chosed normal start and then a message apear
file \widows\system32\config\system
windows failed to load because the system registry file is missing, or corrupt.


all i did is i install tuneup because i notice that he becaume a litter bet slow and it repair 700 problem in the regiter and delete 2 go of temp files i also update my antivirus norton 2008 it expired long time ago but i rerely use internet with it i only put my files that i download it from another one. after update i restart but i make a mistake i choose safe mode so i restart it again and thn it apear the problem that i mention before.

i'm thinking it's a virus in my files

but the real problem is i leave in algeria in the store they only have downloaded french version beside my pc is original hp vista home premium my dad bought from america and the guy in the store said even if i download english version hp will not accept it
i don't wanna format it

what should i do?
please i realy need hepl