How a particular application handles formatting of objects, such as pictures has little to nothing to do with whether your OS is 32 or 64 bit. Your email may be set to text where his is set to HTML or some other setting but it has nothing to do with W7.
Can you go to 32 bit? Sure, first back up all your data to be safe and write down you licenses / product keys, Then, if you have the 32 bit discs or can download them, your W7 product key is valid for 32 or 64. The install will also require completely new drivers for all your devices, most of which W7 will likely find on its' own but it may be a hassle if you don't have them all beforehand just in case; for example, what if it is the network driver that W7 doesn't have? Then you won't be able to connect to the internet to find it because you have no network connectivity. Also, since this is a fresh install, once the OS is installed, reinstall all your programs and restore all the data. If you bought your computer from a major manufacturer (Dell, Gateway, etc) you may need some of their software (most is useless trialware crap etc but they generally slip one or two programs in there that you want or need so that you have to install it all & then remove the excess). And if your machine has more than about 3.25GB of memory it will no longer be able to use anything above that amount.
The world will be going 64-bit and personally I would never want to go back to 32.