I have tried a whole variety of spyware programs,some with good and some with poor results, Malwarebytes and SuperAntiSpyware seem to be the two that as good reviews. I have used Malwarebytes and am at present trying- testing SuperAntiSpyware. So it might be worth a look at http://www.majorgeeks.com for the download of that program or reviews and downloads of many others?.
Would mention that I was having 'router' suspicion due to its recent activity of erratic behaviour, but ruled this out because I have spent a few months with my ISP and BT in resolving some serious service and connection issues. People have suggested hardware problems, but as I have previously stated, my problem seemed to eventually point to a confliction with the browser programs and possible update. The computer now seems to function very well since I sorted that out (we will have to wait and see!).