No, it's the account you use on Windows 7. Since you dont understand then this likely hasn't been changed.
However, the version of iTunes yo uare using should work fine under Windows 7. First let's try re-installing the software and see if that resolves your issues.
Go to the Control Panel and click "Uninstall a Program" or "Programs & Features" to uninstall iTunes and related software components in the following order and then restart your computer:
Apple Software Update
Apple Mobile Device Support
Apple Application Support
If you have trouble uninstalling any of the above, try the following Microsoft Fix It utility to troubleshoot the uninstallation:http://support.microsoft.com/mats/Program_Install_and_Uninstall
Once you've completed the removal, restart your computer and re-install iTunes again. Make sure you download and install the latest release:http://www.apple.com/itunes/download/
If you *still* receive errors when attempting to install/uninstall or sync after installation, try temporarily disabling any anti-virus or firewall software you may be running. If the above does not help, let me know and we'll diagnose further.
If you still have concerns, simply reply back before rating. I'll be more than happy to work with you further. Hopefully, this info will answer your question. When you are satisfied, please give my answers a positive rating. You are judging my personal service only (not this website or your issue) and positive ratings assure I remain in good standing.
Thanks and good luck,