Title's pretty explanatory. I have an application(Second Life) that isn't compatible with 64-bit windows 7. It says that it is compatible with Windows XP, Vista, and 7 but only the 32-bit version of 7. I need to know if it's possible for me to download something to make the application compatible with my computer. I've run troubleshooters and ran it as windows compatible XP service pack 2 and tried again with service pack 3.
I have run SecondLife on Win 7 x64 without issue in one of our teaching labs. The only thing I needed to do was to install the graphics card specific driver rather than the Windows 7 install default version.
Your question caught me by surprise as all I did was download and install it, didn't do any magic to get it working.
Although I have not personally installed this program, I do not see any reason a 32 bit Windows 7 program will not run on 64 bit Windows 7 (I'm sure there are certain exceptions to this). I have run numerous programs that do not state having 64 bit compatibility on Windows 7 64 bit. If there is an issue you can always run it in XP mode.
The system requirements page states the following in the Linux section:
If you are running a 64-bit Linux distribution then you will need its 32-bit compatibility environment installed.
NOTE I'm not suggesting you switch to Linix, but that there there might be a way to get it working if you can use a 32 bit environment somehow.
I've also found this on a page giving detailed information about SL compatible systems
At some point while scouring the web for more information about this problem I saw a message that indicated that all 32-bit OpenGL apps were failing under Windows XP x64 on the 8800 series boards.
It could be that the limitation is due to the OpenGL implementations. The page goes on to give a workaround that involves copying the drivers manually into C:\WINDOWS\SysWOW64, plus the usual caveat about being careful.
That 32bit program might have some 16bit code, as W7 64bit does not support this. If you have W7 Pro or Ultimate you can install XP mode and run it on XP inside of W7
Otherwise you will have to run other Virtual OS software to run XP inside of W7.
Others have mentioned XP Mode, which -- when properly capitalized -- refers to a copy of "real" XP run inside a more-tightly integrated Virtual PC. It requires Windows 7 Professional, Ultimate, or Enterprise.
EDIT: this tighter integration is achieved by displaying the XP session through Remote Desktop, which is limited to 16-bit color by default. If you need more, you can try enabling more color depth by following these steps. Or you can try disabling the Integration Features.