Database cause high server load

[DoctorX]

Use top command and put the result here.

Mysql uses 130% .

install mysql 5.5.12 its fastest mysql version
then optimize it using mysqltuner
and install memcached for database cache and install Eaccelerator with php 5.3.6 .

My current version is 5.1.41, is that an old one?
I'll try to do these things.
Thank you.