Problems Installing HP Toptools 5.6

[CA1324520]

I'm having difficulties installing HP toptools V5.6 on an LXR 8500. I'm getting the following error message: "Hostname mismatch: adlpcd1.ugd.att.com (required). If recent network changes have occured, such as Active Directory migration, a reboot of the system may be required." I tried rebooting rebooting and this didn't take care of my problem. I took the server out of the domain (rebooted). Then I put it back in the domain (rebooted) and I'm getting the same results. Anyone have any ideas out there would be most appreciated.