Window 10/ Hard Disk Full Error.

Hi,
I recently upgraded to window 10, been fine running the battle net launcher until reset (12-08-15), even running the blizzard games has been fine after updating all my drivers. Since the reset though I keep getting an error message stating that my hard drive is full (BLZBNTAGT00000835 Error).
The issue is that my hard drive is not even 1/3 full but I am getting this problem every time I start up the battle net launch after a week or so of having Windows 10.
Anyone one else having this issue or have a possible solution?
Please help.
I didn’t find the right solution from the Internet.
References:-
https://eu.battle.net/forums/en/wow/topic/15162421614
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Thanks