There are a few reasons why your IP may not be hidden while using the software, or that you are unable to browse with Hide My IP turned on. They are as follows:
1) A firewall or security program is stopping the program from hiding your IP. To fix this add hidemyip.exe and hidemyipsrv.exe to your security programs as an exception/authorized program. A walkthrough for popular firewall programs can be found here: http://www.hide-my-ip.com/firewall-config.shtml
2) You may have more than one IP hiding program installed. These typically do not function well together. You should uninstall any other IP hiders in order to see if they are interfering.
3) You may be using a program in the PC tools family of programs such as Registry Mechanic or SpyWare Doctor. These programs interfere with Hide My IP and stop it from functioning correctly. There are free alternatives to these such as MalWareBytes (http://www.malwarebytes.org/products/malwarebytes_free) for a spyware tool and Comodo System Cleaner (http://system-cleaner.comodo.com/) for a registry cleaner.
One of the above three issues causes 99.9% of problems with IP's not being hidden or not be able to browse. However, there are a few other reasons why you might not see your IP as hidden:
1. You did not delete your browser, Java, or Flash cookies before returning to a website that you visited with your real IP address.
-Clear all cookies from your browser, then delete your flash cookies by visiting Adobe's site here:
2. There are 2 (or more) versions of the software installed on your computer.
- Uninstall any other "hide IP" software you may have
3. The computer was not restarted after the install.
- You must restart the computer after installing Hide My IP
4. Hide My IP was activated when the browser was already running.
- You must first start Hide My IP; have it find a faux IP address for you and then activate your browser.