Have you tried the solution on this ms kb KB840685

WORKAROUND
To work around this issue, add the DependOnService registry entry to the following registry subkey on the server, and then set the DependOnService registry entry to MSSQL$SHAREPOINT:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SPTimer
To do this, follow these steps.

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SPTimer
4. On the Edit menu, point to New, and then click String Value.
5. Type DependOnService, and then press ENTER
6. On the Edit menu, click Modify.
7. In the Value data box, type MSSQL$SHAREPOINT, and then click OK.
8. Quit Registry Editor.

see the full kb article for details

http://support.microsoft.com/?id=840685

Good luck