We have a regression suite and it is working fine for the combination of Windows32 bit, Silk2006 and Excel 2003. But The same suite is not working if I run against Windows 2003 Server (64 bit). Silktest is unable to recognize DotNet objects. Any workaround is there?

Silktest 2006
Windows 2003 Server (62 bit)
Excel 2003 (DotNet addIn)

P.S> But It is working for Silktest 2006R2Sp2.