Not the best on computers mate, but ive always managed to sort any problems ive had, Download and install CRAPCLEANER, from Piriform, then analyse, once you have done that, run the programme, what browser are you using, install Firefox, int explorer sucks
Crapcleaner, there is a free version, also perhaps you may have Malware, Download and install Malwarebytes, and here is a good one, you will be surprised at what this picks up, Superantispyware, free version also.