Creating a split screen effect I have two videos of the same length and I want to create one video with those 2 in a split screen manner. 

I'm totally new to this field and I will probably never need to do this ever again so I'm looking for a quick and easy way that involves free software. 

I tried VirtualDub but I'm lost in it's options and settings and I don't even know if it can do what I want to do. 

EDIT: Context: each video is a recording of a PC screen. I want to show them in a split screen manner in order to display the way one PC influences the other. Audio is of no importance.
FFmpeg, a command line tool, can accomplish this, via this command.

ffmpeg -i left -i right -lavfi [0:v][1:v]hstack -pix_fmt yuv420p -an combinedvideo.mp4


Replace left with filename of video to be positioned left. Same with right.

ffmpeg (32bit static build) can be downloaded from here. The ffmpeg.exe is in the bin folder of the archive.