Old pc game..! HELP!

ive been trying to find the name of this pc game that used to be on my dads computer.
from what i remember you were a little ufo flying thing, there was a red and blue team. the blue team flying robot things would kill you if you got near.
You had to collect your flags that were in various places around the strange looking environment (that was mainly walls and floor..very 2-d was reasonably early game i think)
You bumped off things, almost like a ufo bumper car.
its really annoying me that i cant remember the name!

Linky: http://en.wikipedia.org/wiki/Hover!