hi David, try this and I'm sure it'll Solve it...
1. Restart the computer and see if you are able to run the setup. If the restart does not help, use the steps that follow:
2. Perform these steps and then run the SQL Server 2000 setup again: a. Click Start, and then click Run.
b. In the Open dialog box, type: "Regedit" (without the quotation marks) or "Regedt32" (without the quotation marks)
c. Click OK.
NOTE: Please make sure that you only delete the value mentioned, not the whole session manager key.
d. In Registry Editor, expand the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet \Control\Session Manager
e. On the File menu, click Export.
NOTE: In Microsoft Windows 2000, click Export Registry File from the Registry menu.
f. In the File name text box, type: "Session Manager Key" (without the quotation marks)
g. Click Save.
h. In the right-pane of the Registry Editor window, right-click PendingFileRenameOperations. On the shortcut menu that appears, click Delete.
i. In the Confirm Value Delete message dialog box that appears, click Yes.
j. On the File menu, click Exit.
NOTE: In Windows 2000, click Exit on the Registry menu.
k. Restart the computer.
l. Using the Registry Editor, verify that the PendingFileRenameOperations registry value is not available.