I am using Windows Vista Basic and whether i try to run the cmd.exe my computer sudden shutdown. the reason that i run cmd is because i wanna find the physical address of my computer to connect with my college wireless.
I have Readed many topic about this and is it because my laptop is infected with Virus?
Currently i am using NOd antivirus system and i try to scan with it and didnt find any virus or malware.can anyone help me on this?
Is Nod antivirus better than other type of antivirus such as Norton and AVg? or should i change my Antivirus XD.

NOD32 is an excellent antivirus program Don't change it!

Please look in your Event Viewer to see if there are any errors around the time that you try to launch cmd.exe. To do this, go to Start and type in "eventvwr.msc" (without the quotes) and press Enter.

Expand the category named Windows Logs and check both the Application and System log files for errors around the time that the crash occurred. You can double click on the error to get more information about it.

This could be a virus that's escaped the NOD32 but we'll have to see what the computer has to say first.

You may also want to run the Performance Report tool to see if there's any errors there. Go to Start and type in "perfmon /report" (without the quotes) and press Enter. Let the report create itself, then check for any red x's. Let us know what you find.

Oh Ok. XD