Oddy

You shouldn't have to do it all the time. It just tells the mac where to point the save file. I'm not sure about extracting. I'd have to look into that.

So the Mac is saying that the folders that in fact do exist 'do not exist'?
 
If so...
 
1) Create any New TextEdit document, and click Save.
2) When the Save Dialogue box pops up, navigate BACKWARDS to the absolute Top Level Folder of your Mac (probably called something like "Macintosh HD" or the like - we are talking the level ABOVE your User name / account). 
3) Click on that Top Level, and then navigate from there down through your User account to the actual folder where you would like to save your document.  It does not matter how deep your desired folder is located as long as you Start from the absolute Top Level of your entire system.
4) Click Save. 
 
Hope it works. If it doesn't just quote me and I'll try to find another solution.

Hey Oddy. I hope this helps you out. It's for your zip file issue.
 
It's likely that filename.zip is either not actually a .zip file, or is corrupted.
 
Open up Terminal. You can access it by typing "Terminal" into Spotlight.
 
Enter the command(s) in the steps below into your command line prompt (triple click the line, copy it, and paste it into your prompt). Replace filename.zip with the actual name of the zip file.
 
If the name of the file contains spaces, you need to enter it differently using the escape \character. For example, if the file is named compressed crap.zip, you'd type compressed\ crap.zip in the command line.
 
Step 1:
Repair disk permissions. Once done, attempt to open the .zip file again. If you wish, you can do this from the command line.
diskutil repairPermissions /
 
Step 2:
Use file to confirm it's actually a zip file:
 
file ~/Downloads/filename.zip
 
The output should be: Zip archive data, at least v2.0 to extract
If you don't receive this output, post the output as a comment before proceeding.
 
Step 3:
After confirming it's actually a zip file, attempt to unzip it directly from the command line:
 
unzip ~/Downloads/filename.zip -d ~/Downloads
 
Step 4:
Step 3 will likely fail. Run the zip command to attempt to repair any corruption and salvage the contents of the archive (again, replace filename.zip with actualname.zip):
zip -FF ~/Downloads/filename.zip --out ~/Downloads/Repairedversion.zip
If it executes cleanly, you'll be directly returned to your prompt. Quit Terminal. Navigate to your Downloads folder and double click Repairedversion.zip- it should unzip without issue.
 
Alternatively, it may not exit cleanly. If you're presented with
Is this a single-disk archive? (y/n):
Hit the y key. After you're returned to the prompt, again attempt to open Repairedversion.zipfrom your Downloads folder. If you're still unable to open it, comment below with the warning(s) received from the command. If you've reached this point though, it's likely that the file is irreparably damaged.

Your license ties itself to "your system" (probably meaning the motherboard) but should continue to work after only an SSD swap. Windows 10 seems to activate itself automatically via Microsoft's servers, so don't be surprised if it "just works" without prompting you for your key.
 
The Windows software is freely available from Microsoft's website. You'll need to set up a USB flash drive or DVD yourself, though.

Ah, I didn't know where you are from.
AMD is not as cheap in the Netherlands as in the US..
 
150 euros for that card is a pretty good price (hardware.info and tweakers.net have the lowest prices at around 153 euros).
 
The biggest difference is that the R9 270X is a bit better (better performance).
But it uses 1 or 2 6 pin connectors. It uses more power and runs a bit hotter.

750 Ti cards are mostly a good option for people with a low budget and a bad PSU/small PSU.
I would recommend looking into the AMD option(s), which is the R9 270(x).
 
How much is that card where you live?
If you really want to stick with Nvidia, sure. It's a good card for the price. 

I would save up 20 euro more and get a 270 https://de.pcpartpicker.com/part/gigabyte-video-card-gvr927oc2gd. The 750ti is a good budget card but just for a bit more you can get the 270 which is the better choice. Also i think your cpu is a i5 4430, there is no 3440k 

750 Ti is a good card but I would get the PNY Enthusiast edition over the EVGA FTW, it comes higher clocked on the core and the memory out of the box. Dunno if it's available over there but the model number is VCGGTX750T2XPB-OC if you want to search for it.