how to debug ie8 in visual studio 2005?

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Visual-Studio

i've write a activex pluging runing on windows XP with IE6,it works right.

When i debug my C++ project in visual studio 2005 after updated ie6 to ie8,it broken.

after looking for MSDN solution as follows:

In most scenarios, setting the registry value TabProcGrowth to a DWORD value of 0 is sufficient to resolve this problem.

1) Open RegEdit
2) Browse to HKEY_LOCALMACHINE -> SOFTWARE -> Microsoft -> Internet Explorer -> Main
3) Add a dword under this key called TabProcGrowth
4) Set TabProcGrowth to 0

Refer:msdn blog

but it doesn't work...

will you tell me why?

i'm using windows xp 64-bit computer.