I tunes not working on windows 7 32 bit?

I have an iphone 5c but i tunes version is not working. My friend had the same problem but after installing 64 bit windows 7 on his pc the problem was solved, so if i have to install windows 7 64 bit on my pc will all my data be erased?

No, I had this problem with my school laptop, If you uninstall the 32-bit version and re-install the 64-bit there should be no problem, only if you delete the media files in your music/itunes folder