Well, if he formats the Windows partition, he'll most likely have to reinstall all programs, whether they were originally installed on the OS partiton or another partition.Originally posted by: GodlessAstronomer
You only need to format the Windows partition though, no reason to format the whole drive if it is partitioned. If you have any installed programs on other drives (bad idea in any case) then some of them will not function without a reinstall.
Originally posted by: corkyg
I would first run Microsoft's Vista compatibility download to see if your machine is Vista capable.