Recovering Windows 7 registry

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http://ubuntuforums.org – Hi there. I tried to find something similar to my problem by googling but didn't have any luck. Here is the problem. I have messed my registry after using a program to uninstall and mistakenly removed registry entries that shouldn't have been touched. Now my windows starts however I can't open anything or any folder since it has no associations. I do have 4 backups in a .reg files. I was trying to restore my registry with those backups but I cannot enter the safe mode neither open registry/cmd prompt and like I said before cannot open anything at all. My question is if anyone knows (Hardware)