Streaming (BBC iPlayer + 4OD) stopped working

Hello all!

I'm hoping someone can help me with this. From one day upon another, BBC iPlayer and 4OD stopped working (I'm in the UK), some online video content works fine and some doesn't and some online radio stations falter too.

This is on a PC Sony Vaio running Windows 7/ 64 - nothing else seems to be wrong, although I did get a blue screen which lead to a crash a few days ago. Trying other browsers doesn't help, not does a PC cleanup so far.

Any ideas welcome!