I prefer when software I want to run either comes in a specific language, or lets me choose the language during installation. In an effort to be more user friendly a lot of software is configured to detect the region your computer is set to. I prefer to run my OS in English, but have my region set to Norway. This results in a lot of software ending up with a Norwegian UI. Here is how you fix this for QuickTime 7:

1. Download the QuickTimeInstaller.exe from Apple.
2. Extract it using e.g. 7-Zip
3. Download and install the Orca MSI Editor.
4. Open QuickTime.msi in Orca
5. Go to ViewSummary Information…
6. Find the Languages box and delete all language ID except the language you want. In my case I want English which is 1033.
7. Save the MSI over itself.
8. Repeat the process for AppleSoftwareUpdate.msi
9. Install QuickTime by double clicking QuickTime.msi
10. Open Explorer and find the Apple Software Update installation directory. Either C:Program Files (x86)Apple Software Update or C:Program FilesApple Software Update, depending on your system architecture.
11. Open the SoftwareUpdate.Resources folder and find the language you want (still English for me), e.g. en.lproj.
12. Copy the SoftwareUpdateLocalized.dll from the folder of the language you want, into the folder Apple Software Update is using. Again for me; copy SoftwareUpdateLocalized.dll from the en.lproj folder into the nb.lproj folder, overwriting the existing file.
13. Repeat for the SoftwareUpdateFiles.Resources folder.

Now both QuickTime and the Apple Software Update should both display the language you want.

PS: You can’t just delete the language folder you don’t want from the SoftwareUpdate.Resources  and SoftwareUpdateFiles.Resources folders. If you do Windows Installer will repair the application the next time you try to launch it.