HD Install :: init.rc

hi
I had  a frugal install of dsl up and running fairly well on my hda3, being hda2 my swap partiton.
on hda1 I installed another linux distro (puppy) and then choosed to install grup on the mbr: bad idea!
this has lead to the impossibility of accessing dsl. grub apparently gives me a message about a "not found kernel.."
I was wondering why, and a friend of mine told me it's missing a init.rc on dsl partition and that this can be caused by grub. is this real?
what can I do for having my dsl back to work?
I thought of dowloading  the latest .iso, burning it and installing it again,  choosing the upgrade option, but I'm afraid that i should  re-install grub and then this would mess up the OTHER linux partition...

any idea?
thanks