Tracking cookies threat

I think that my laptop was attacked about 3 weeks ago as it closed down suddenly whilst i was on a live streaming website and caused a loud beeping noise.  Since then i have been running security scans daily and always have between 5 - 40 cases of tracking cookies being removed.  When i view the norton history there is a large historic list that shows unauthorised access blocked.   Does this sound like my lap top is infected in some way and if so is there anything further that i should be doing other than daily norton scans?

 

Any help or advice appreicated.

thanks

N