Unity not installing

Hi,

my pc has a virus, i think, as my hard drive space on C: keeps depleting no matter what...anyway when i go to install unity it says "not enough space on dribve" or something like that.... I was wondering how i could fix this so that i caninstall it onto my d drive without having that message

When installing unity go to CUSTOM, and select a drive in there, that should fix it.

However generally speaking virusus stop things working, they dont change the ammount of free space you have, except for possibly deleting files.