Question about Crucial Mx300

I think if you have a bracket and replace the old hdd then yes but I am not sure.

As that computer is so old I dont even see the point of investing 100 CHF to upgrade the harddrive.
For instance (just an example) you can get this computer instad for 179 CHF more. A more modern, working computer with SSD disk and everything else you need to do regular stuff. Ok it is bigger computer but...

HP 250 G5 (15.60", HD, Intel Pentium N3710, 4GB, SSD)