Windows xp shutdown after entering ipconfig, cmd on start-run...

could be a virus

do a system restore if possible to before the issue stated, then run a virus scan (maybe run an online scan in case your installed antivirus has been infected) something like housecall.trendmicro.com

If you cannot do a system restore in full windows, try it in safe mode (tap F8 during boot, select safe mode)

remember off system restore

go computer right click properties
then system restore