if a computer runs two windows programs?

what do you mean os or program re question dont make sense if ya talking about

os then you can do whats called a dual boot where two windows operating systems booting but only one at a time can work. if ya talking about two windows programs running its very easy to remove one of the two. sorry re write your question please thanks bye.

if you mean you have 2 separate operating systems such as windows on your computer, yes you can remove one of them - it involves the partition that your hard drive created when installing windows - if you have a large hard drive you can create more than one partition and have an OS on each partition - i would not recommend doing this unless you know what you are doing though as it can be easy to mess up your hard drive

I've not actually done this but I think you have to delete the partition and rebuild the MBR.

Good Luck

delete one of them