Dll not loding in vista

hai guys,

i am distributing a external winodow hook dll (vbf meour's hook dll) to the users system32 folder while installing my app. but after the installtion, when program is laucned, the dll loaded in vista, but no hooking. if restarted the pc only it works. but no problem in xp. it works fine after installation.

whats wrong?

this is teh innosetup code

Code:

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Source: "D:\myproject\distribusion\xxxhook.dll"; DestDir: "{sys}"; Flags: ignoreversion

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:confused:

btw, it is a vb6 application.