It's actually a Windows Installer error. Was Quicken already installed on this computer?
Please try running the installer program as Administrator. Right-click the program. Click "Run as Administrator" to execute the installation program.
If that is successful, download and install the available bug fixes for 2011
Old Quicken Patch downloads 2000+
When running an old, unsupported Quicken for Windows version you may no longer be able to download bug fixes (patch files) directly from Quicken. However, until further notice they are still available here: US version: http://www.quicknperlwiz.com/quicken-patches-us.html Canadian version: http://www.quicknperlwiz.com/quicken-patches-canadian.html
You might try creating a new Administrator account and installing with that. Sometimes the problem is the Windows user profile gets messed up for installing certain programs like Quicken.
You could also try the free Revo Uninstaller to remove any remanents of the previous Quicken installation.
https://download.revouninstaller.com/download/RevoUninstaller_Portable.zip