The current documentation at
https://docs.anaconda.com/anaconda/install/ clearly states that your system must be Windows 8 or newer, and directs you to use archived versions that may meet your requirements.
You have not provided any details on the version of Anaconda that you used. Or screenshots of any errors that might have occurred, the actual version of the os (beyond "Windows 7")...
It is difficult for anyone to help you without this information...
Regards,
Jim