pirut is a graphical frontend to yum(8). Pirut can install, remove, or update software packages. Pirut also allows searching, or viewing and installing software package groups.
I've never used Linpus, so I won't be much help, but I can try. Be aware that you might have a hardware problem. Memtest86+
will sometimes catch hardware problems which cause runtime errors. Note that other components can cause memory to appear to fail (mainly CPU, MB, PSU).
Look and see if there are any other yum frontends installed. You can use those instead, or use them to reinstall pirut.
You may need to resort to the command line. Type ctrl+alt+F1 to reach the first terminal. login and type:
sudo yum install pirut
(I assume "sudo" is required, but I don't know with linpus. You may need to login as root and skip "sudo".)
This will hopefully install the latest version of pirut from your repository. It you already have the latest version, you may need to uninstall it first. The documentation for yum is here
(ctrl+alt+F7 will probably return you to return to GUI mode; on some systems it's ctrl+alt+F5. If that doesn't work, try each of them until it does.)