安装postgresql时，不安装自带的pgAdmin 4\n通过https://www.pgadmin.org/download/pgadmin-4-windows/，下载最适配的安装包，单独安装适合操作系统的pgAdmin 4

【The pgAdmin 4 server could not be contacted安装postgreSQL后启动pgadmin错误解决方法 - CSDN App】http://t.csdnimg.cn/sY29T

最新的pgadmin4已经不支持win7系统了。

2016年发布的postgresql9.5.3自带的是pgAdmin3，兼容win7。

https://www.filehorse.com/download-postgresql-32/25830/

PostgreSQL 9.5.3 (32-bit)

May, 12th 2016  -  58.6 MB  -  Open Source

Operating System

Windows XP / Vista / Windows 7 / Windows 8 / Windows 10

Author

PostgreSQL Global Development Group

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.
Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of PostgreSQL 9.5.3 (32-bit). 

For those interested in downloading the most recent release of PostgreSQL or reading our review, simply click here. 

All old versions distributed on our website are completely virus-free and available for download at no cost.
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