Please note when using steam using a VPN may violate the TOS of steam, do so at your own risk.

Steps to try first:

1. Make sure the VPN is disconnected
   
2. Open steam, browse a few pages in the store.
   
3. Connect to the VPN, browse a few more pages then go to the page you wanted in the first place. 

Steps to try when the above fails:

Close and reopen steam.

Open STEAM, disconnect from the VPN, reconnect to the VPN browse around for a bit.

Open Steam with the VPN disconnected, Browse steam, connect to the VPN.

Please do not delete any folders as you may wish to restore them, please re-name them to something else so steam recreates them.

• Change your account profile Country location
• Close Steam (Steam -> Exit) Do not press the "Cross" button, this will minimize the windows to the task bar.
• Rename Program Files\Steam\appcache 
• Rename Program Files\Steam\config\htmlcache
• Rename Program Files\Steam\config\cookies
• Rename Program Files\Steam\ClientRegister.blob
• Rename Program Files\Steam\userdata\    - The folder in here will be a random number, rename it to make it recreate.