Spreading virus!

Now it's not H1N1 that is scary to me, but the virus in laptop that always make me headache! Now this virus is unable to delete from the system as I thk it is already getting down to the end and controlling my laptop. Now I have been called as virus spreader by Shao Yin for whenever she plug any handy in my laptop sure infected by the virus. Do I really need to reformat or any other solution? I don't really like to reformat my laptop as everything seems need to start reorder after reformat, n sometimes I hardly found my documents back!...