bootcamp stopped working, not enough space on 2tb harddisc

i have installed windows 7 using bootcamp on my mac mini, but it suddenly stopped working, so i deleted windows 7, and tried to install it again, but when it tells me to choose a hardrive, i chose my 2TB. harddisc and it moves along, untill it tells me that it hasnt got enough space, ihave tried to repair my harddisc, but still nothing happened, it simply chrashes every time, because the harddisc isnt big enough.

please help

Mikkel