I got one problem on registering a 64bit assembly during theinstallation. The installation package was developed using VS2005setup project.I could not invoke this assembly after installation. I believe thereason is the assembly had not been registered properly duringinstallation.(The assembly works well if I run Framework64/regasm.exe manually ) Ialready set the Register property of the assembly to vsdrpCOM in setupproject.

I guess it is VS2005 bug. I have to edit the MSI using ORCA. I changed the "Attributes" value to 260 from component table in ORCA. then it worked fine.