Hello. In linux, you almost always install software through packages pre-compiled for your particular distribution. These are roughly akin to .exe files in Windows. Each distro has some sort of package management software. In opensuse, you use Yast, or from the command line, zypper.
Each distro maintains their own online repositories of packages. Official packages are pretty much guaranteed to work properly, install properly, all that. There are also 3rd party community repositories that offer packages for distributions, usually of software that can't be included in the official repos because they are patent or license-encumbered, or otherwise non-free. The quality of these sites and packages can vary, but in generaly, the big well known ones are quite good. Package management system - Wikipedia, the free encyclopedia
For setting the root password on the aspire one, try this first.
My impression of Linpus Lite is that, well, it's not very good. Part of the problem is that it is based on Fedora 8, which is getting long in the tooth, and it uses some custom libraries, all of which make installing new software kind of challenging. I own one and I ripped out Linpus first thing, put on Arch.
Here's some Aspire One related links: 30 Cool Acer Aspire One Hacks! Dependency problems on Aspire One Linux |