Security software on your PC may be doing something strange.
I would guess Anti-Virus applications as well. However, one other problem could be if there is an issue with the Temp directories on your system.
You could try running CCleaner to clear up any cache and temp file problems you might have on the system and see if that helps. CCleaner is a great (and free) utility that will clean up all of the "dreck" that accumulates on your hard drive and browsers over time. One thing to be careful with it, though... By default it will delete all of the browser cookies on your system. So, either disable these settings for your browser, or (better) go to the Options > Cookies part of the application and choose the specific cookies that you want CCleaner to keep (the websites you actually use and want them to keep you logged in and whatnot) and then let it delete the rest of the tracking cookies and stuff.
Also, when you run it for this purpose, you might want to try unchecking the setting under
Options > Advanced called
Only delete files in Windows Temp folders older than 24 hours. If one of those files is corrupt and is preventing the MC installer package from extracting, you want to make sure you get EVERYTHING out of there.
You can get CCleaner here:
http://www.ccleaner.com/I actually wonder if that recent SSD problem wasn't actually a Temp file or Cache problem. The error just didn't make a lot of sense that it could have been caused by the physical hardware in the SSD (which is, as far as the OS is concerned, no different from a spinning magnetic disk).