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What is the difference between user variables such as PATH, TMP, etc. and system variables?
I accidentally deleted the user variable PATH. What am I supposed to do?
Right-click My Computer and go to Properties->Advanced->Environmental Variables…
What’s above are user variables, and below are system variables. The elements are combined when creating the environment for an application. System variables are shared for all users, but user variables are only for your account/profile.
If you deleted the system ones by accident, bring up the Registry Editor, then go to
HKLM\ControlSet002\Control\Session Manager\Environment(assuming your current control set is notControlSet002). Then find thePathvalue and copy the data into thePathvalue ofHKLM\CurrentControlSet\Control\Session Manager\Environment. You might need to reboot the computer. (Hopefully, these backups weren’t from too long ago, and they contain the info you need.)