I think this is the stickiest of questions which I have encountered in the Technology section of AB.
Anyway, I have done a bit of research and can assure you that you Do Not have a Virus in your computer or, for that matter, in your oven; be it gas or electric.
It would appear to be the case that the beating of ingredients is most important.
Incidentally, whilst i think that you were right to give ColinandJess 'best answer' I think it should have been for her last one ...."You need to cream your butter and sugar until it's almost white that should stop the top going sticky.".
Still Not too late to change the best answer. Just click the last answer above for ColinandJess.
Cheers ....Hans. ☺☺☺