Sound/Mic Problem {Windows 7 RTM}

There seems to be a small problem here.

My speakers work fine normally, but I was using Skype, and when they answered the call, it popped up with No Speakers Detected. I then tested my sound using the 7 Volume Control, and it made no sound.

I then ended the call on Skype and sound resumed to normal.
It's the same problem with my in-built Mic.

It also does this on Windows Live Messenger. I don't know what the problem is, but I'd like to fix it asap.
If you need it, my laptop is Compaq Presario CQ61-107TU

and oh, thank you to everybody who helps out in advance. :)

Shameless self bump. :p

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