You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

. Whenever you get a message / popup that software / files need to be updated;

DO NOT USE ANY OF THE PROVIDED LINKS

While this may be a legitimate message, it could also be Malware or a Virus. Any time you want or need to check for upgrades, go to the website of the True Owner of the program in question. For example, to check out Firefox, go to https://www.mozilla.org {web link}

You can also report such a site at; Google Report Phishing Page {web link} which is the same when done while on site by going to Help > Report Web Forgery

Help us safeguard Mozilla’s trademarks by reporting misuse {web link}

Firefox 47.0 is the current Release.

Firefox updates whether for Windows, Mac OSX or Linux are done internally in Firefox itself (with a .mar file as you can see here for example) and by download from mozilla.org like say http://www.mozilla.org/firefox/all/

There is no such thing as Firefox_update.exe or Firefox_patch.exe or such similar names of exe and these are always from random sites as scammers have been using this tactic in last few years to try and trick inexperienced Windows and or Firefox users into downloading and infecting their Windows if they run the said .exe

virustotal always found these fake exe's to be trojans, viruses and such malware.