Windows 7 Urgent!-Changed dpi tp 500 and now cant do anything

[aimpacc]

URGENT!!!!!

ive accidently changed the DPI to 500 just to try and i cant do ANYTHING right now.
i also tried SAFE MODE reg edit and still doesnt work

IM SCREWED! :'( HELP HELP HELP

 

[Super Sarge]

try using your OS operating disc and do a repair