Windows 7 - Problems with Windows Live / Webcam

Hi Guys!

Im using Win7 prof. 32Bit and a MC VX-800 Webcam with the Windows Live Messenger 2009...
First of all, my PC recognizes the webcam, but the LifeCam Tool from MS tells me, that he could not find a cam...
Then, when i start the LiveMessenger and configure my Audio- and Video setiings, LiveMessenger finds the cam, i can configure it and so on.
Then, if i want to start a webcam chat, Windows Live freezes, i can not chat anymore (but i can use other programs..Firefox etc)
After a short period of time - about 2-3 mins, Windows Live tells me, that he could not start a Webcam chat...
Neither if i invent someone or someone invents me.
Same problem if i get invented to his/her webcam..
Nothing change.

I hope, you can understand my problem...
II know, my english isn't the best...
But it would eb great, if you can help me out!

Best regards

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