Yes, the system is compatible with Windows 7 because it's not an application rather than a web service. You can check the official requirements below:
Minimum: Windows® 98 or Macintosh OS® 10.4.11
Recommended: Windows® XP+ or Macintosh OS® 10.5 Leopard®
Minimum: Internet Explorer 6.0
Recommended: Internet Explorer 7.0 or Safari 3.0 (for Mac ® computer users)
You can check for more information on the following website.