Unable to install apps from Windows 10 Store

I'm unable to install / update / repair any app from Win10 Store. I couldn't find any solutions, hence posting here.

This keeps happening despite repeatedly resetting Windows. Once I reset my PC, Store seems to work for about 1~2 days and then starts showing the following error msg:

Something unexpected happened

Reporting this problem will help us understand it better.  You can wait a bit and try again or restart your device.  That may help.

Code: 0x80070005

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^{[Image of error msg while installing any app through Windows 10 Store]}

I followed what Microsoft suggested:

1. reset Windows 10 Store app through cmd and gui [both failed :(]
2. almost every link suggested by Google (https://www.google.com/search?q=windows+10+store+not+working&oq=windows+10+store)
3. Also contacted Microsoft Support as a last resort, but to no avail.

Lastly, I thought this was because of my University's restrictions on Win 10 education; however, other PCs & laptops [with same version of OS] don't seem to have this problem.

It is able to update Windows apps like Microsoft Office 360 and other system apps distributed through Win10 Store.

Has anyone else faced this problem before in any dist. of Windows 10? Did you find any solutions?

PC config details:

• Alienware Aurora R7

• Win10 Education V1809

• Intel Core i7-8700K @3.70 GHz

• 32 G installed RAM

• Nvidia GTX 1080Ti