problem Use ocx in C# 2005 and vista x64

[user32]

Hi all,
I have a system with CPU X64 & Vista Ultimate X64, in this system I install VB6 and visual stdio 2005 , also I have 2 OCX file and I can use this 2 ActiveX in VB6 , but when I create a project in C# 2005 and then put any ActiveX , now when run my project get this error and my programm not be run !!

Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))


while I register OCX file with REGSVR32 command, and not any problem in use OCX in VB6 !!!!!!!!!!!!!

Please help me