At the c:\> prompt type:
look at the resulting screen to see if Windows is actually on the machine.
The above prompt and switch is asking for a display of the contents of C: page by page.
You can scroll though the pages by pressing space.
If the OS is there:
Type in :
If you cannot see the files on the screen after the first prompt above then you do not have a full OS on or it or there is something untoward going on with (Pertitions?)