เอาง่ายๆ เปิด Regedit แล้ว ลบ HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings ไปซะ จากนั้นรัน IE มาใหม่
อ้างอิง http://answers.microsoft.com/en-us/ie/forum/ie8-windows_other/error-message-unable-to-open-this-internet-site/758f7a64-b081-4981-814f-9a7a53434fb8
Support Engineer
Hi ThiaClark2010,
What is the version of Internet Explorer that you’re currently running?
This happens if theContent Type registry setting for .xml file types is incorrect. To resolve the problem, use one of the following methods:
Method 1: Register msxml3.dll file
a. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
b. Type the following command and press Enter.
regsvr32 msxml3.dll
Now check if you’re able to download files from Internet Explorer.
Method 2: Try the following registry fix
Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 (http://support.microsoft.com/kb/322756/ ) How to back up and restore the registry in Windows
a. Start Registry Editor.
b. For a per-user setting, locate the following registry key:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
For a per-computer setting, locate the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
c. On the Edit menu, click Add Value.
d. To override the directive for HTTPS connections, add the following registry value:
"BypassSSLNoCacheCheck"=Dword:00000001
To override the directive for HTTP connections, add the following registry value:
"BypassHTTPNoCacheCheck"=Dword:00000001
e. Quit Registry Editor.
Now check if you’re able to download files from Internet Explorer.
Method 3: Reset Internet Explorer settings
If the issue still persists, then try resetting Internet Explorer settings.
http://support.microsoft.com/kb/923737
Hope this information is helpful and let me know if you need any further assistance.
Mouneshwar R – Microsoft Support
