Capable? Yes.
But will you want to run PPro on that machine? Add some more spice... Forget about the Celeron and go for A64 or P4, add 1 GB of RAM and a larger (at least 120 GB) hard drive, or two - for the flavour. Video editing loves dedicated hard drives.
Even if it's just an every day PC, don't go cheap on it. You might be using that for a while.