Missing Windows Command Prompt issue

Hi,
I am not sure what happened to my computer. I don't know if this is a sort of a virus. When I typed cmd on run, nothing appears.
I opened the C:WINDOWSsystem32 and add cmd.exe to manually open it, I waited for few minutes for it to appear but it doesn't.
All I can see on the location of cmd is a space between two .dll registry files.
My system is running normally and has no signs of any virus, spyware or malware attack, but to make it sure, I run my Norton 360 and scanned the whole system, but found 0 infections.
I go back to the location of cmd from C, and notice the space between the 2 .dll files, thinking if I accidentally deleted the cmd on its location.
Anyway, I want to know how I can fix this, because cmd is one of the major features of windows. My operating system is Windows XP Home Edition with Intel Core 2 Duo.
I don't have any recovery or installation disk with me so, I really can't figure out what to do with it.
How can I recover my missing command prompt? Or how can I create a new cmd?
I am seeking for assistance.
I hope someone here can help.
Thanks.
