virtualbox.org

Hello,

I'm trying to install the guest additions on a CentOS 5.4 guest. I'm not having a lot of luck with the vbox guest addition iso uploaded with vbox. Should I be using an older version of guest additions? If so, I'm not sure where to get it from. Thanks for any info.

Depends on what you are having problems with?
CentOS 5.4 (IIRC) does not have a new enough Xorg to do resize, and you would need to manually set the resolution in the xorg.conf file.