You can easily boot dos from a floppy disk and do c from there. Try to find a copy of ms-dos 6.22-install it onto your hardrive on a new partician-then sys a floppy with the new system and manually copy the operating files to the floppy from windows-or if you know dos-xcopy. There is tons of help on learning c on the internet. I believe some c compilers will also operate in a windows dos window. If you don't know msdos you need to learn that before you tackle c++.-Its pretty easy us old timers grew up on cpm and dos.
When In Doubt-Format and start over