A virus attkd my pc few days ago..whenevr i opn ny foldr n move out f dat foldr, dat foldr cnvrts into a virus

i hav latest up 2 date avast antivirus, bt it didnt detect dat virus.. dn i downloaded norton 360 .. it detct dat virus n deleted dose foldrs dt hd been cnvirtd to virus...but dose foldrs cntain my songs games.. now my hard disk z showing dat it cntains sm heavy files(f drive 14 gb used) bt whn i opn dat drive it shows only combo drive foldr(78 mb)..dat means my songs r on my disk bt in sm typ of hiddn state.. tools>foldr options>show hiddn files z also useless...plz help me hw to relocate my songs..sm songs 4m dat foldr were lidtd in winamp which i cn play nw...dat means songs r nt deletd bt hiddn smwhr..plz help