Lost All Environment Variables

I was tring to install some hp software and was getting msi errors. So reading there forum it was suggested to delete the temp file. With that said i deleted all variables. now can not restore or msconfig regediet or anything with anti virus. I hope i can fix this mess, with your help. running windows 7 ultimate. I tried to rerun setup disk . error variable command not found. so i can not even run a cd or dvd. Also lost admin rights. :cry:
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