Server system drive is to small

I have inherited a server with my new position that has a system drive that is to small. The drive is a c drive that was allocated 4 gig of space. It only has 73 meg of space left and I need to move files and free up some space in a hurry. I have done all that I know by getting rid of files and applications that are unneeded but it is not enough. I think the big problem is the winnt folder with all the windows updates that are necessary for security. There is no unused part of the partition. Is there a way to move system files to another partition?

Thanks for any help.