Looking under the Activity Monitor Application I noticed that Parallels is running in 32 bit mode on my MacBook Pro 2.33. I have 3GB of ram installed, OS 10.6.2 and I have upgraded my hard drive to 500 GB a while back. I just purchased a copy of Windows 7 Ultimate and having a hard time deciding which version of Windows 7 to use, the 32 bit or the 64 bit under parallels 5. My gut feeling is that since my MacBook's EFI is only 32 bit and parallels is not running as a 64 bit application, I'm probably better off using the 32 bit version of Windows7. After searching for days on the Parallels forums I found a post where the Parallels team was recommending using the 64 bit version on a newer MacBook pro that had 4GB of memory and is capable of loading the MacOS 64 bit kernel. Nevertheless, since my machine is older and has less memory I would really like to hear what you guys think.
