What do you mean "default mail client is not installed properly"?

point to a link let me send a message, the result pops up a dialog box, said "because the default mail client is not installed correctly, so cannot do this operation." Specific solutions:

If you have Outlook on your computer, you can set it up and use it. His website is used to directly launch your computer's mail sending software. The settings for Outlook are as follows: 1. Open Outlook (that is, Outlook Express), tap Tools, and then select Account.

2. Click "Add" and select "Mail" in the pop-up menu to go to the Internet Connection Wizard.

3. Enter your name in the "Display Name:" Field and click "Next".

4. Enter your full 163 free email address (you@163.com) in the "Email Address:" Field and click "Next".

5. Enter pop.163.com in the Receive mail (POP, IMAP, or HTTP) server: field. In the outgoing mail server (SMTP): field, enter: smtp.163.com, and click Next.

6. Enter your 163 free mail user name in the "Account Name:" Field (enter only the section in front of @). Enter your mailbox password in the Password: field, and then click Next.

7. Click "Finish".

8. In your Internet account, select the Mail tab, select the account you just set up, and click Properties.

9. In the Property Settings window, select the "Servers" tab, tick "My server requires authentication" and click on the "Settings" button next to it.

10. Login Information Select Use the same settings as the incoming mail server to ensure that you have entered the correct information in each field.

11. Click "OK".