Class Not Registered error when installed to another computer

Dear all,

I am currently developing an application with MS Visual Basic .NET and Component One 4 Q1 2004 and integrate it with DevStudio InstallShield 9 to build the installation files. I have several forms in it. It is ok when i install the program in my computer, and ran it. However, when i install it to another computer and then ran the program, it displays error "Class Not registered", but other forms works ok. For your info, I have installed Microsoft .Net Framework at the client computers, and try to register all of the dll i used with Regasm.exe, but still it displays "Class Not Registered" when i click buttons to open forms. I am stuck with it. Please help me.....

Thanks!