RUN - Ipconfig command not working

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http://hardforum.com – For some reason whenever I try to run ipconfig, once i hit enter, the window pops up for like a milisecond and then goes away. Never had this happen and can't find anything about it on the net. There's no error message or anything like everyone else who's had a problem with it, Any thoughts ? edit - even tried the full command, c:\Windows\System32\ipconfig.exe, still same problem. (Hardware)