MD5 algorithms have, within the last five years, been outdated and replaced, but if you should still be using MD5, it might serve you well to download this trial of MD5 Checksum Verifier. It is also valid to use this trial software to discover if a system is using MD5, but unless the computer has been locked in a vault for more than ten years, it probably doesn't.
All the same, if you are using MD5 to send encrypted files just for the fun of it, this software trial will check to make sure your files have been received and are intact. This is also a useful tool for classroom learning regarding outdated encryption systems and the sending/ receiving of files using the specific encryption of MD5.
There are a few other creative uses for MD5 Checksum Verifier, but I will not divulge what they are (lol, just a little encryption joke!). The maker of this program states it can be used with all Windows operating systems, but I would recommend not using it past Windows Vista because MD5 hasn't' been used since 2007, and no one really knows how it would function on a newer OS. The developers also state that the new addition of support for Win8 is built in, although I'm not sure why seeing as no one has that yet (and won't until fall of 2012).