Accidentally deleted an environment variable

I didn't see which one it was, but its silly that it gives you no warning and I accidentally clicked the delete button on the system variables than the user variables.

I've restarted my computer and so far its fine, but does anyone know what I can do to get it back? Do I need it?

I use XP, and tbh If my pc is ruined by a small mistake like that; then windows frankly sucks.
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More about accidentally deleted environment variable
  1. If you know which var you deleted, or at least what group it was in, someone with default values can report what they are so you can put them back. or.....

    You can do a system restore point rollback.
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