I can not open my windows document

Solution
from microsoft.com


"

Set your default programs

Use this option to choose which programs you want Windows to use, by default.

You can choose the programs that Windows uses by default.

If a program does not show up in the list, you can make the program a default by using Set Associations.

1. Open Default Programs by clicking the Start button, and then clicking Default Programs.

2. Click Associate a file type or protocol with a program.

3. Click the file type or protocol that you want the program to act as the default for.

4. Click Change program.

5. Click the program that you want to use as the default for the file type you selected, or click the arrow next to Other Programs to show additional programs. (If you...
from microsoft.com


"

Set your default programs

Use this option to choose which programs you want Windows to use, by default.

You can choose the programs that Windows uses by default.

If a program does not show up in the list, you can make the program a default by using Set Associations.

1. Open Default Programs by clicking the Start button, and then clicking Default Programs.

2. Click Associate a file type or protocol with a program.

3. Click the file type or protocol that you want the program to act as the default for.

4. Click Change program.

5. Click the program that you want to use as the default for the file type you selected, or click the arrow next to Other Programs to show additional programs. (If you don't see Other Programs, or your program is not listed, click Browse to find the program you want to use, and then click Open. If no other programs are installed that are able to open the file type or protocol, your choices will be limited.)

If you don't see the program you want to use as the default, click the arrow next to Other Programs to see a list of programs available on your computer

6. Click OK.

Notes
· You cannot change an association for a file type or protocol and leave it blank or disassociated. You must select a new program.

· The options you set here only apply to your user account. Your choices won't affect other user accounts on this computer.

Refer the following link for more information:

Change which programs Windows uses by default "




http://answers.microsoft.com/en-us/windows/forum/windows_7-files/file-association-fix-for-windows-7/2120d7eb-3f9d-464b-bff9-8b5132e72b3a
 
Solution