Do this > In the IIS Manager, go to the application pool you have set for the storefront, goto Advanced Settings, set "Enable 32-bit Applications" to true. This will make the site run in explicit 32-bit mode.
The only thing you will be doing is limiting the available memory for the app pool you have associated with aspdnsf - but still lots of space so no noticible performance issues unless you are doing something BIG with your site
We have our site running fine ona 64bit server in 32bit mode - tell your dev partner !!
8.0.1.4 W2008R2 64-bit MSSQL2005