[Solved] After sign on to share point online, it ask for the credentials when trying to open a word or excel file

After sign on to share point online, it ask for the credentials when trying to open a word or excel file

How do I resolve this issue 
and I have windows7 and ie8

Keys to the Problem After sign on to share point online, it ask for the credentials when trying to open a word or excel file

Download Error Fixer (Free)

To check for Windows updates

1. Open Windows Update by clicking the Start button Picture of the Start button, clicking All Programs, and then clicking Windows Update.
2. In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.
3. If any updates are found, click Install updates. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

Recommended Method to Repair the Problem: After sign on to share point online, it ask for the credentials when trying to open a word or excel file:

How to Fix After sign on to share point online, it ask for the credentials when trying to open a word or excel file with SmartPCFixer?

1. Click the button to download SmartPCFixer . Install it on your computer.  Open it, and it will perform a scan for your system. The errors will be shown in the list.

2. After the scan is done, you can see the errors and problems which need to be repaired.

3. When the Fixing part is done, your computer has been speeded up and the errors have been removed

Related: Fast Solution to Problem: Error http//go.microsoft/fwlink/?linkId=144689 occurs at every reboot,,Troubleshooting:I tried to download the latest version of Internet Explorer 9, but it will not update the download due to a message that states "Wrong version of Internet Explorer installer" Error,Fast Solution to Error: IE9 Search Taking Me to Web Pages Rather Than Search Results,Random freezing after updating to SP1 (Windows 7) Tech Support,[Anwsered] Thinkpad 8611 Boot,How to Resolve - Svchost Helper?,Fast Solution to Problem: L30 101 Driver Windows 7,Troubleshooter of Error: Io Device,How to Fix Error - Dell Laptop Code 39?
Read More: All applications (.exe files) unable to start correctly, (Application Error 0xc0000005) [Anwsered],How to Fix Problem - after installing the april 12 updates i cannot connect to internet?,After installing SP1, my \"sleep\" function fails. Must power on manually. [Anwsered],After my computer name was changed, C:\\Users shows wrong user name,Troubleshooting:After repairing Word 2010 starter it as it asked. It won't let me open Microsoft Word 2010. It pops up and says internet lost and then freezes.,Able To Install Multiple Versions Of Office?,A couple of years ago I downloaded a homeccounting template I can't find now is there a place where I can look for other templates that are not lis ated?,add on information bar - Preventing me from being able to download anything,addin for excel doesn't exist in "C:\Program Files\Microsoft Office\Office12\1033",Adding degrees on Calculator