slow speed

[scasn4]

Ok using surface rt and have fiber optic broadband with download speed of 75MB and upload speed of 20MB. And I keep getting this message saying download speeds are too slow when trying to download anything from the store.

I have nothing else connected to the router which is a Huawei HG533
I can do everything else except download from the store even stream 1080p on youtube which of course would need a fast download speed for.