Windows 7 all the system variables are deleted how to get them back

i accedentally deleted system variables in my windows 7. And now i was unable to install any program or the software. Inorder to set them again i was unable to open the advanced system settings also there it is getting a message like "windows cannot find '%windir%\system32%systempropertiesadvanced.exe.' so please tell me the way how i can get rid of this problem without reinstalling the system]
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  1. leela7 said:
    i accedentally deleted system variables in my windows 7. And now i was unable to install any program or the software. Inorder to set them again i was unable to open the advanced system settings also there it is getting a message like "windows cannot find '%windir%\system32%systempropertiesadvanced.exe.' so please tell me the way how i can get rid of this problem without reinstalling the system]


    Sorry - Inplace upgrade / repair install is your solution.
    http://support.microsoft.com/kb/2255099
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