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You can install DQS 6.1 on Win7, if that is all you have. Note that you can't install 6.1 on a 64bit version of Windows 7.
The way to get it to work is you MUST do the install as an "elevated" rights user. Since you install via IE, that means you must run IE elevated. The way to do this is to, if you are in the Start menu, right click and select "Run as Administrator". If you have IE pinned to your taskbar, press [SHIFT] + [CTRL] and mouse-click the IE icon. You'll know if you have started it if you see the dialog named "User Access Control" and the screen goes dark.
If you don't install using the Admin rights, it won't work, period.
If you have already installed DQS as a nonadmin, uninstall it before trying to reinstall it.