Please Help any help would be great cant install vista

i downloaded the 32 bit version and iv been trying to get it installed for
the last 3 weeks iv went out and bought a new dvd burner thinking my burner
was bad but thats not it. I get to 88% into the install and it gives me the
cant install box iv tried this on 4 other computers and its the same thing
each time i should have ordered the install disk from microsoft and then
waited to install the download version too long and now it seems im up the
creek here please if anyone can help im going crazy i want vista. P.S Does
anyone know where i can order a install disk ?? Im willing to pay