what is wrong with my laptop

[iandouglas]

hi.
trouble wit lappy.
if i try to google something it redirects me to another site usualy advertising something.
if i click on nissan site from favourites for example it eventualy loads but its very slow .
i set my anti viarous soft ware to do a clean up .it found trojons and add ware.
ive deleated them ,but i am still having problems.
any advise please.
rgds.iandouglas