Is installing a 64-bit version of Windows 7 going to change some video device issues on my computer?

I recently had a new hard drive installed on my computer, to which Windows 7, the 32-bit version was installed. My computer is compatible with the 64-bit version. Since these changes on my computer, I noticed that I am limited to some personalization options that I had before. For example, I can no longer change the color of the task-bar. None of the screen-savers are available now and most of the games that come with Windows 7 don't work or are really slow. Would these work again if I installed the 64-bit version of Windows 7?