Issues with Store

So I'm having some major issues with the Store application at the moment. The issues started appearing day or two before the November update was released, and I couldn't install any application through the Store. (It was returning an error, can't remember which one.)

After I managed to install the November update the issue disappeared until recently when it started happening again. I decided that today I should try a way to fix it. I saw some guides on the internet, by restarting the services, using WSRestart, rebooting and nothing worked. I also came across a few guides that required me to write some code on the Powershell command. Unfortunately one of them did this to the store:



Any way to fix this issue please? Is a clean install the only thing left for me to do now?

EDIT: The error I was getting on the Store while installing was 0x80240438

So after a quick system restore to the previous day, the Store is back as it was. But I still can't download applications, anything at all. It says "Starting download" for a second and then switches to "Give us a few minutes". After clicking 'See details' this appears:



As I said I did have this error before, briefly, but it got fixed after applying the November update. Now its back again and it is very annoying.