Question : Win 7, running 32bit software on a 64bit machine

I have win 7 64bit laptop, but must run a 32bit application. Is there any way of booting to 32bit r switching after boot?

Answer : Win 7, running 32bit software on a 64bit machine

IF you are running Win7Pro, Enterprise, or Ultimate, you can use XP Mode (free, but installed separately) and run the app that way.  Otherwise, as stated, the VAST majority of 32 bit apps that run under Windows 7 x86 (32 bit) will run fine in Windows 7 x64 (64 bit) with the exception being devices that must interact with the hardware directly.