I cant open regedit in windows 8

I tried to change the default installation directory in regedit and I restart my laptop and now I cant open regedit any more!! before I close it I got a backup on my desktop. please help me I cant Install any thing any moreee!!!

go to run and type "gpedit.msc" 
click on user>administrative template>double click on system>double click Prevent access to registry editing tools>click not configure or disable.then apply then click
ok
check that setting. If not retore your registry and beware when editing your registry..
Don't forget to mark the post that solved your issue as "Answered." By marking the Answer you are enabling users with similar issues to find what helped you. Lewis Renwick - IT Professional

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