Why does this happen when I attempt to use wireless internet?

hi, i am trying to fresh format my windows vista (with a windows xp cd cus its all i have) but it doesnt work because... when i boot from the cd and unload all the files, it says 'starting windows' but then tells me to restart because theres probably a virus that forbids me from starting windows. and its true, theres a virus which is why im trying to reformat my computer... the virus doesnt let me do anything except buy the antivirus software, which i know it just a trick. please help... very important for what i need to do tomorrow .. oh god..  

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