I bought a Lenovo SL 400 laptopn almost 3 years back when vista was fairly new and full of bugs. My laptop came with a downgrade cd of windows xp. It did not take me long to donwgrade form vista to xp. The problem now is that at some locations my wifi does not connect. At my house even I have to use an ethernet wire to connect to the internet. I want to know how can I upgrade back to windows vista OS. Please help !!