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

#1
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
 


#2
try using your OS operating disc and do a repair
 


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