Taskhost.exe taking up 30% cpu

I updated from W8 to 8.1 a couple of weeks back. Had another minor update today. Only noticed today that Host process for windows task   taskhost.exe  is permanently taking up around 30% cpu.

Shut off and back on - didn't go away. Ran a full scan - no problems.

What's going on and how do I fix it?

Thanks.

First time I've posted on here - and I am not at all technical. Got to see if I can find my back to this forum for a start! (Gave in with the labels box)