7-Zip / Cannot Create Temp Folder Archive

I bought a new Microsoft surface pro 3 It originally had windows 8 installed on it.From the instant that I unboxed it, turned it on, and accessed Wi-Fi connection, there were almost ALWAYS errors when installing certain plugins or programs from the internet. Instead the errors always came with the message can not create temp folder archive etc. or something of the like.

I downloaded Window 10 because it looked comfortable. No change; none of the programs that I download from internet explorer, edge, or google chrome work. No plugins, and sometimes no important pop-ups either.Another problem... which I have a feeling is related... I downloaded Microsoft office too. All of it worked except for Microsoft Word. Every time I try saving something, regardless of which button I click on, there is absolutely no response and none of the files are saved...

I looked into the internet for answers and there weren't that many. One video on youtube seemed to have a solution. It advised that I go into some advanced settings under the properties of my pc and click on environment settings and... do something I don't really understand. The instructions were:

User variables for {userName} and change the TEMP and TMP vars values to "c:/temp or something like that...
 
This PC was brand new, and yet these errors surfaced from the beginning and I still can't fix it.