I think you have it backward, It's the 32-Bit machines that can only support the 32-Bit OS. The 64-Bit machines can support both OS.
I think what he means is that the only configuration Sony sells these laptops in is 64 bit versions of windows 7.
Sounds just like Sony to me.
There is no quick and easy downgrage option to 32 bit from 64 bit. However, all of your laptop hardware is supported on 64-bit, and apart from Microsoft Office Groove
live file/folder sharing and Onenote's
insert file as print out(s) features, I've yet to come across an application that doesn't work fine on 64 bit.
The only way to get a 32 bit OS on that laptop is to do a clean install of one, and that means you need to get a copy of one and a license for it. You might be able to get one from Sony for free... It's definitely worth a try.
Another option (which again involves paying for an upgrade) is to upgrade your version of 7 to professional, which offers XP Mode (which will basically install XP 32-bit on a virtual machine, and allow you to run applications out of it on your regular operating system). Anything that worked on Windows XP is also supposed to work in XP Mode on windows 7.
For example, Office Groove live folder sharing
does work when installed in XP Mode on my 64-bit windows 7 ultimate installation (still not an ideal setup though... Microsoft is said to release Office 2010 in the summer, which will supposedly finally support 64 bit systems).
Personally I'm not a big fan of either of the above options.
May I ask which applications you're having issues with?
Many applications with older installers simply have issues installing on windows 7 (and sometimes running) because of the new file and directory structure and permissions, but these can be solved sometimes by:
1. Running them as an administrator (right click on shortcut and choose
Run as Administrator.
2. Running them in compatibility mode for another version of windows (95-Vista sp2)
3. Some applications that have issues with the permissions settings for Program files and Program Data directories can be resolved by changing the permissions for their individual installation/data directories.
The bottom line is, however, that most applications
can be installed/run on windows 7 64-bit. It would be much easier to help with the installation and setup of each application individually (and like Coco said, most 32 bit applications do work fine in 64 bit).