This finally fixed the Windows 7 random disconnect from Maplestory! Worked for me, hope it works for you!
Thank me if I helped
Step 1: Start the System Configuration Utility
Click Start , type msconfig in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or provide confirmation.
Step 2: Configure Selective Startup options
- In the System Configuration Utility dialog box, click Selective Startup on the General tab.
- Click to clear the Load Startup Items check box. Note The Use Original Boot.ini check box is unavailable.
- Click the Services tab.
- Click to select the Hide All Microsoft Services check box.
- Click Disable All, and then click OK.
- When you are prompted, click Restart.
Me (Posting the fix)
Microsoft Support <- Original Microsoft Support thread