The paths depicted below could help migrate your WSS 3.0 & MOSS 2007 (32-bit) Products to SharePoint 2010.
Products are needed to be migrated in their respective 64-bit versions and then their 64-bit versions will be Migrated to SharePoint 2010 which doesn’t offer any 32-bit support.
E.g. If you want to upgrade from 32-bit version of MOSS 2007 then firstly you need to upgrade to the 64-bit version of MOSS 2007 and then from 64-bit version of MOSS 2007 you can upgrade to SharePoint Server 2010.
