What is wrong in this server?

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http://serverfault.com – I have a vb 3.8.4 forum and a drupal pressflow 6.22 site on together on my hosting server When i added the drupal site to the server I had a lot of performance problems in the server And sometimes it made the server go down Here is the host server specifications : Operating system CentOS Linux 5.5 Webmin version 1.560 Kernel and CPU Linux 2.6.18-194.26.1.el5 on x86_64 Processor information Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz, 2 cores Real memory 3.74 GB total, 2.35 GB used Virtual memory 4 GB total, 124 kB used Local disk space 1.76 TB total, 147.63 GB used Here is the basic (HowTos)