|If your previous compiler is a 16 bit application, 64 bit Windows systems no more support legacy DOS applications.|
I strongly suggest you install a free 32 bit C/C++ compiler as e.g. OpenWatcom. Google for them as there are lot on the net.
An alternate way is to download and set up Microsoft Virtual PC 2007 (free) then install as guest OS FreeDOS, the free Open Source DOS clone, and run your legacy C/C++ compiler.
A bit more complex but absolutely feasible for a college student.
MS Virtual PC installs under Home Premium too, just ignore the warning message, or install as virtual machine VirtualBox, free Open Source software previously developed by Sun Microsystems.