the lenovo looks good but it seems to be heavy(3 kilograms + charger) and big if it really has a dedicated numeric keyboard(it says it is 15.6" screen, not sure about this)
i remember some users having problems with a nvidia 240m, not sure if this 310 is better or more linux friendly
can you test it before buying it? with a recent kernel, a remastered version maybe?
about the virus
i normally wipe everything on the hard disk and then divide hard disk into two parts, one for linux and the other for windows(i already paid for it, i will use it)
remember to get a installation disc for the windows you got, if not find one on microsoft or in internet