There is no reason to talk to you like you are an idiot. We were probably all technology challenged when we got our first windows device!
The first thing I'd suggest you do is perform a
hard reset to return the device to factory settings. To perform a hard reset, push the reset button and the power button and hold both buttons for 3 seconds, then release them and follow on screen instructions...
A hard reset will remove all of the prior user's settings, files, and anything else they might have added to the device and return it to its factory settings. Right after you perform the hard reset, the RAM memory on the device will be as good as it's going to get. Some software, like Word, Excel, and any other software you see on the device after the hard reset, is installed in the device's ROM memory and there is no way to remove those applications. Even if you were able to remove those applications, you would not get any useful memory since ROM memory is never available to end users.
You can install a lot of programs, and probably even your medical software to a storage card that you'll use with the device...just consider it another drive.