This is a very common issue while installing Magento 1.9 on localhost. If you are an experienced developer and have good knowledge about virtual hosting. You can create the virtual host for Magento setup.
Quick solution without a virtual host.
We need to disable URL validation here.
- Inspect “Base URL” input in firebug/ inspect element chrome
- Remove “validate-url” from the list of classes
- Click “continue” button