Hi enp518,
Welcome to Apple Support Communities.
We have some information in this article that may be helpful:
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
To install iTunes or QuickTime software, you need to be logged in as an administrator on the computer. If you're not sure if you have administrator account access, you may find this Microsoft article helpful:
Windows 7: How do I log on as an administrator?
Otherwise, refer to the Help documentation from Microsoft, contact your IT department, or visit support.microsoft.com for more information.
Best,
Jeremy