Itunes incompatible with Windows 7?

I have windows 7 and am running 64 bit
itunes USED to work ok before there were a few glitches but it was ok
now since I have downloaded the latest itunes (yes I downloaded the 64 bit version) it has not been working at all. I would open it and it would not pop up. So i went to task manager and it says itunes*32.exe. After about an hour or so itunes would open but it would just be frozen.
I have completely uninstalled it and all components of apple 6 times now.. I have tried to download the lastest itunes once again and an error msg would show up

*The version of this file is not compatible with the version of Windows*
*you're running. Check your computer's system information to see whether*
*you need an x86 (32-bit) or x64 (64-bit) version of the program, and then*
*contact the software publisher.*

I have no idea what this means bcoz i downloaded the 64 bit version!!!

so i tried to download an older version i tried 9.2 which did not install..
and then tried 8.2 which installed but does not work!!!

so when i try to run 8.2 itunes NOTHING happens when i click task manager there it is in processes again as itunes*32.exe

I have never had any other version of windows on this laptop but i have tried to change the compatibility to other versions.. did not work ofcourse..

then tried troubleshoot and it just says itunes is incompatible..
i really dont understand how a month ago itunes was working and now its not

yes i have sweeped my computer for viruses and downloaded all the updates windows has suggested..

I dont know what else to do im no computer whiz

i have seen a fair few people with similar issues

any suggestions???