The simplest way I think would be to convert the video to dvd. The easiest way of doing this is to use a VCR and a standalone DVD recorder connected via a SCART lead. Press play on the VCR and record on the DVD recorder. Once done you could run it on a PC and connect the PC to a projector and a monitor.
You will have to convert the VCR content, which is Analogue, to Digital. As a computer cannot easily store Analogue, you will have to transfer the content to a Digital medium such as DVD, as above. Then you will be able to save the DVD content to the computer hard drive.
It's not simply a matter of finding the right leads to connect the VCR to your computer.
Which brings me back to my suggestion of using a standalone DVD Recorder connected to a VCR. Very easy to do, the DVD recorder automatically records in digital meaning you do not have to convert the files or anything else. If you don't own a standalone DVD recorder ask your mates, almost certainly one will have one and it is very easy to do.