Can't eject DVD

I have a Dell laptop running Windows XP. Sometimes I can't eject the DVD.
The easiest way to solve this problem is by disabling and enabling the DVD-ROM drive from the device manager.

Just right click on My Computer, select Hardware, find the DVD-ROM drive, select disable, then enable. That's all.

Windows XP VPN were missing

All of the XP's VPN connections were missing. Options 'Dial Up' and 'VPN' in the connection wizard were disabled. So, I couldn't make a new VPN connection.

It turn out that I accidentally disable some of the services.
These are the necessary services:

• Telephony
• Remote Access Connection Manager
• Remote Access Auto Connection Manager

After enabling those services, the previous connections are appeared.

http://www.computing.net/answers/networking/new-network-connection-disabled/36178.html
http://support.microsoft.com/default.aspx?scid=kb;en-us;330163