When you try to open some websites on a Windows Vista computer, you may encounter slow Internet connection speeds and may receive the error message "Page cocould not be displayed" (This page cannot be displayed ).

Solution: To solve this problem, disable the automatic TCP tuning function. To do this, follow these steps: 1. Log on to the computer as a user with administrative permissions. 2. Click Start. In the start search box, typeRunAs/User:Local_computer_name\ Administrator cmd, Then press Enter. 3. When the system prompts you to enter the Administrator account password, enter the Administrator account password and press Enter. 4. At the command prompt, type the following command, and then press Enter:Netsh int TCP set global autotuninglevel = disabled 5. After the command is successfully run, TypeExitAnd then press Enter. 6. Restart the computer. 7. After logging on to your computer, try accessing a website. Kb940266