I updated my iTunes, and now it says Entry Point Not Found?

I have recently updated my iTunes library to 11.2 I believe. I have updated it to get the new iOS software. After I had finished downloading the 11.2 iTunes, I shut off my computer, and when I turned it back on, and clicked on iTunes, it gave a notice saying "iTunes.exe - Entry Point Not Found"
I have incredibly important text messages saved in my iTunes library from previous backups off of my iPhone. It says to uninstall and reinstall iTunes, but I'm extremely scared that it will delete all of my previous backups if I uninstall and reinstall. Please Please Help. I NEED TO KNOW, IF I UNINSTALL ITUNES, WILL IT DELETE THE BACK UPS?

No it won't, that would be ridiculous. Just re-download, then reinstall.