Laptops often/usually come with a whole bunch of crap preinstalled. Often making the poor thing actually unusable.
Look to what AV or 'Registry Scan' or other things that are supposed to 'fix it'. I've seen brand new laptops that are unusable for an hour after power up, due to multiple scanning things stepping all over each other
Second, look to whatever nonsense 'toolbar' thing they have installed.
After that, look at the individual applications.