Hi Bjorn,
Generally we get the error code when the internet connection is poor.
So I would suggest you to check for the internet connection.
Could you answer few questions:
1. Were you able to install apps earlier?
2. Have you installed any third party anti-virus on the computer?
3. Are you using any proxy connection to connect to Internet?
4. Do you use wired or wireless internet connection?
5. Are you able to browse internet properly?
Let’s try these methods ad check.
Method 1:
Run Apps Troubleshooter
I would suggest you to download and run the Modern UI App troubleshooter.
http://download.microsoft.com/download/F/2/4/F24D0C03-4181-4E5B-A23B-5C3A6B5974E3/apps.diagcab
Method 2:
If you have installed any third party anti-virus software, then I would suggest you to disable the anti-virus software and the firewall temporarily and check.
Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do have to temporarily disable
it to install other software, you should re-enable it as soon as you're done. If you are connected to the Internet or a network during the time your antivirus software is disabled, your computer is vulnerable to attacks.
Method 3:
Disable proxy connection
If you use any proxy connection, then follow the steps to disable proxy:
a. Click the
Gearbox at the top right corner in Internet Explorer.
b. Click the
Tools button, and then click Internet Options.
c. Click the
Connections tab, and then click LAN settings.
d. Uncheck the
Use a proxy server for your LAN box.
e. Click
Ok.
Method 4:
I would suggest you to clear the store cache and check.
Follow these steps to do so.
a) On the desktop screen, press
Windows key + R to open run box.
b) Type WSReset.exe and hit
enter.
Reference:
Why can't I find or install an app from the Windows Store?
http://windows.microsoft.com/en-us/windows-8/why-find-install-app-windows-store
What to do if you have problems with an app
http://windows.microsoft.com/en-us/windows-8/what-troubleshoot-problems-app
Do let us know if you have any further queries.