People always discuss if the apps could support in 64 bits server since the 64 bits server arrive to the market and you might not know that the Windows server ASP and ASP.Net could be turn from 64 bits to 32 bits.
To convert your IIS to be used 32 bits apps, open a command prompt and run the following command.
cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
So, now your 64 bits server(IIS) could run 32 bits application without any issue. And you will now need to register the 32 bits .Net Framework as 32 bits framework is not installed by default.
Well done, you have done for all.