[michaeljbrooks]

I am pretty good at getting rid of unwanted installed applications from Windows 2000 Profesional Service Pack 1, but I still cannot get rid of the listing of Diskeeper 5.03.340 trial version in the 'Settings-Control Panel-Add/Remove Programs' on my home system. The message I get when I try to remove the program with the remove program function is 'Diskeeper Workstation can only be installed on Windows Professional. Setup will now exit' and then 'Fatal Error during installation'.
I then deleted all references to Diskeeper and Executive Software from the registry and deleted all the Diskeeper files I could find from my computer but the entry remains in 'Settings-Control Panel-Add/Remove Programs' and gives the same error when trying to remove the program listing.
I also tried re-installing the program and uninstalling it again (with all the same registry and file cleaning) with similar results.
I can install Diskeeper 6 which adds another entry but I can never get rid of the original Diskeeper entry.
Any suggestions on how to get rid of the bothersome defunct listing without re-installing Windows 2000 Professional?

[Corinthian]

Try this, I think I found it on the Diskeeper homepage:

Manual Uninstall of Diskeeper on Windows 2000

Before you begin any editing of the registry, always update your ERD.

The following are the steps to remove DISKEEPER manually:

1. From the Desktop, click START, then RUN. Type REGEDT32 for the command and click OK

2. Select the HKEY_LOCAL_MACHINE hive and go to: SOFTWARE/EXECUTIVE SOFTWARE

3. Highlight the version of DISKEEPER you are using and delete the key

4. Now go to HKEY_LOCAL_MACHINE
SOFTWARE/Microsoft/Windows/CurrentVersion/Installer/Products and delete the key {0815BA4C07B73D118ABF0001B4239620}

Note: If you get the message

"Registry Editor could not delete the key currently selected. The key, or one of its subkeys does not give you DELETE access."

Click OK and then from the Security menu change the permissions settings to Everyone Full Control. Then you will be able to delete the key.

5. Next go to HKEY_LOCAL_MACHINE

SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall and delete the key
{C4AB5180-7B79-11D3-A8FB-00104B326902}

6. Under HKELY_LOCAL_MACHINE,
SYSTEM/CurrentControlSet/Services/
delete the DISKEEPER key.

7. Select the HKEY_CURRENT_USER hive and go to
SOFTWARE/Microsoft/Installer/Products and delete the key
0815BA4C97B73D118ABF0001B4239620

8. Under Installer, double click Features and delete the key
0815BA4C97B73D118ABF0001B4239620

9. Close the registry, reboot the system and open Windows NT Explorer.

10. From where DISKEEPER was installed, delete the Executive Software directory in Program Files and all subdirectories.

11. On the boot disk, delete the Diskeeper directory in this location:
\ Documents And Settings\ All Users\ Start Menu\ Programs

12. If you want to reinstall the built in defragmenter go to the \winnt\inf directory and right click on dfrg.inf. Select install.

Then run

regsvr32 dfrgsnap.dll

and

regsvr32 dfrgui.dll