When I right-click Computer icon -> Manage, it appears an error message: "This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs
control panel." http://c.upanh.com/upload/2/984/KN0.7066057_1_1.jpg
Which version of Windows 7 are you using (Retail version or the Release Candidate)?
Try opening Computer Management from Start Search Bar. Follow the location to open computer management.
1.Click on Start
2.In the Start Search bar type Computer Management and hit enter and check if you are able to open it.
Use the System File Checker tool (SFC.exe) to determine which file is causing the issue, and then replace the file. To do this, follow these steps:
1.Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a
confirmation, type the password, or click Allow.
2.Type the following command, and then press ENTER:
sfc /scannow
3.The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.
For more details follow the link given below.
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7