DllRegisterServer

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I have a problem registering a simple in-process COM object. The object
registers OK on Windows XP Professional, but fails when an attempt is made
to register it on Vista (CTP 5308). I ran the debugging tool "ntsd" and it
produced the following output:

Microsoft (R) Windows Debugger Version 6.6.0003.5
Copyright (c) Microsoft Corporation. All rights reserved.

CommandLine: regsvr32 regtest.dll
Symbol search path is: *** Invalid ***
****************************************************************************
* Symbol loading may be unreliable without a symbol search path. *
* Use .symfix to have the debugger choose a symbol path. *
* After setting your symbol path, use .reload to refresh symbol locations. *
****************************************************************************
Executable search path is:
ModLoad: 01000000 01007000 regsvr32.exe
ModLoad: 77ef0000 77ff2000 ntdll.dll
ModLoad: 77e20000 77ee8000 C:\Windows\system32\kernel32.dll
ModLoad: 77b10000 77bb3000 C:\Windows\system32\msvcrt.dll
ModLoad: 77d60000 77e15000 C:\Windows\system32\ADVAPI32.dll
ModLoad: 77c10000 77cb8000 C:\Windows\system32\RPCRT4.dll
ModLoad: 77cc0000 77d5b000 C:\Windows\system32\USER32.dll
ModLoad: 77bc0000 77c09000 C:\Windows\system32\GDI32.dll
ModLoad: 76d20000 76e55000 C:\Windows\system32\ole32.dll
ModLoad: 718e0000 718fe000 C:\Windows\system32\ShimEng.dll
ModLoad: 756c0000 756e9000 C:\Windows\system32\apphelp.dll
ModLoad: 75c30000 75c4e000 C:\Windows\system32\IMM32.DLL
ModLoad: 71650000 71659000 C:\Windows\system32\LPK.DLL
ModLoad: 72a30000 72aaa000 C:\Windows\system32\USP10.dll
ModLoad: 71950000 7198e000 C:\Windows\system32\uxtheme.dll
ModLoad: 10000000 1003b000 U:\MyProjects\RegTest\Debug\regtest.dll
ModLoad: 76c80000 76d10000 C:\Windows\system32\OLEAUT32.dll
ModLoad: 76b80000 76c04000 C:\Windows\system32\CLBCatQ.DLL
ModLoad: 77b00000 77b09000 C:\Windows\system32\VERSION.dll
ModLoad: 76610000 76624000 C:\Windows\system32\atl.dll
ModLoad: 73d90000 73e4c000 C:\Windows\system32\msctf.dll


At this point I get a popup dialog containing the following:

"DllRegisterServer in regtest.dll failed. Return code was: 0x80020009"

This dll registers OK when Visual C++ 6.0 registers the dll after
compilation on Vista.

Any clues as to where I go from here.

Thank you,
Rick