PC with about 256MB. Whats A Good distro to use?
 

I tried puppy and Fedora 9 and both either are to slow(fedora) or runs fast but I cant seem to install it onto the HDD for some reason(puppy). Any ways I'm leaning towards XUBUNTU but what do you guys think?

Xubuntu would be reasonable as XFCE doesn't require nearly as much system resources as KDE or GNOME; but it also depends on how fast of a processor you have.

Is there a reason you can't get any more RAM for the system?

Xubuntu would be a good option. It will give you most of the options that Ubuntu gives you without eating much of your ram. But another 256mb can run Ubuntu as well so if you can spend some money on it go for it.

You can go even lighter than xfce, Debian with lxde. Even with Iceweasel open with several tabs including at least 1 flash tabs and streaming media I rarely use more than 200 mb of ram on my eee.

I would go with XUBUNTU since it uses less resources. I am running UBUNTU 8.10 with 384mb memory and a k6-III processor and it runs fine even running desktop effects.

Debian with lxde does indeed run very nice on low spec hardware. and with Debian you can do a base install to start with and not get all that extra junk most other distros install by default.

DSL would be another option.

A short while ago I experimented with VectorLinux, which seems to be very lightweight, but on the other hand, it will probably be quite a bit of work to get up and running, depending on how lucky you are regarding hardware support. Anyway, it's an easy install, and I thought it was fun seeing just how lightweight you can go so if you are similarly inclined, give it a go.

p.s.
Just to avoid too many comments on the subject: I know that there are many lightweight options out there and that a lot of them are smaller than VectorLinux, but VL struck me as the most fully fledged, which is why I chose it over the others.