Uninstalling and then reinstalling your iTunes should also get your Bonjour reinstalled.
For the reinstall, use an installer downloaded from the Apple website:
... or you could get it back via your Apple Software Update for Windows.
If you'd prefer not to uninstall iTunes, try the following procedure.
Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
Download and install the free trial version of WinRAR:
Right-click the iTunesSetup.exe (or iTunes64setup.exe), and select "Extract to iTunesSetup" (or "Extract to iTunes64Setup"). WinRAR will expand the contents of the file into a folder called "iTunesSetup" (or "iTunes64Setup").
Go into the folder and doubleclick the Bonjour.msi (or Bonjour64.msi) to do a standalone Bonjour install.
OK I went in to the first link and realised I dont click RUN I click SAVE AS and it saved as itunessetup.exe and I downloaded WINRAR but when I right clicked on itunessetup.exe there was no option to extract only compress so I just clicked than and now god knows what I have done. Why is itunes so complicated. I wish I could find help that was simple to understand and do for someone not familiar with technical IT stuff. Anyone any ideas what Ive done and basically all I wanted was to reinstall bonjour, as I have reinstalled itunes in the past and lost about 600 songs - so dont anyone suggest reinstalling itunes it always loses stuff! Please anyone any idea how to reinstall bonjour simply ???