Step 1: Install the software DOSBox. download here
Step 2: Download and extract TC. download here
Step 3: Make sure that the DOSBox and TC are in the same directory and the TC.exe application is in the Folder TC>>BIN>>TC.exe for this to work.
Step 4: Run DOSBox
Step 5: Type the following commands at the command prompt mount d c:\
Step 6: Now you should get a message which says: Drive D is mounted as a local directory c:\
Step 7: Type d: to get into d:
Step 8: Next follow the commands below:
Step 9: Type cd tc
Step 10: Type cd bin
Step11: and type tc or tc.exe [This starts your Turbo C]
Step 12: [Important Step] In Turbo C Editor, go to Options>Directories>Change Directories>Change the source of TC to the source directory [D](i.e. virtual D: refers to original c:\).