Can't launch Yahoo Messenger and can't play DVD!!!

I'm using Windows 7 Premium Home. I can't sign in yahoo messenger. I tried to install other older versions but it still did not work. Everytime I sign in ym, this table appears:

I don't know what wrong is it. Can anyone help me pls?
And one more thing, my laptop doesn't have a CD ROM, that's why I have to use an USB CD-ROM. I can't play DVD with my Windows Media Player... I don't know if that is about windows media player or the CD ROM.

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