TO Uninstall MOSS Manually

If you get the problem regarding uninstallation in your Sharepoint office server or if uninstall window gets disappear on click unistall option, then try the following steps. These steps help me.

Step 1:
Disable and Stop the following services in Start>Administrative Tools>Services
-Microsoft Single Sign-on Service
-Office SharePoint Server Search
-Windows SharePoint Services Administration
-Windows SharePoint Services Search
-Windows SharePoint Services Timer
-Windows SharePoint Services Tracing
-Windows SharePoint Services VSS Writer

Step2:

Delete the following registry hives in Start>Run>Regedit.exe

a) HKLM\Software\Microsoft\Office Server\12.0
b) HKLM\Software\Microsoft\Shared Tools\Web Server Extensions\12.0
For 32bit:

c) HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\OSERVER

For 64bit:

c) HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\OSERVER

Step3:

Delete the following folders

a) C:\Program Files\Microsoft Office Servers\12

b) C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12
c) C:\Program Files\CommonFiles\Microsoft Shared\SERVER12 (if u find this folder then delete it)
After performing above steps u find Moss uninstall from your machine

Step4.

Restart the server and start Moss installation again.
After an installation, if u get error to run Sharepoint Product and technologies configuration wizard then you can uninstall Moss from control panel or by running setup file, now it will completely remove Moss.