how to revoke dselect messed up?

["Benjamin F. Zhou" <zhoub@fisci.com>]

Hi,

I installed potato on my notebook. the installation facility looks
really nice and easy to use.
But at first, I could not check the boxes I prefered and exited. I don't
know how to get back. So I entered Dselect and did a lot of +/-, which
messed up the selection. I was warned that if I proceed with install, I
may ruin my installation.

Is there a way to revoke what I have done there and restore the default
selection?

BTW, what is the minimum set I must install from base to run X86 ?

thnx a lot.
Ben