I just found out that my PATH system variable in Windows is nearly empty (it has only the path to the ExtFS tool - I installed that one recently , and I'm guessing it overwrote the Path instead of appending to it). I came across this answer on searching, but I seem to have no previous versions or restore points to recover from (the Open button has no arrow mark next to it either).
I had quite a bunch of programs in PATH, and I'd hate to have to find them out one by one by encountering weird errors every now and then. Is there a way of restoring the PATH variable in this case? Any other place that this information is stored in?