I have note book of acer extensa 4220 its camera

Hello there!
Wheather is a new laptop or used , you have to verify this,
1) If you dont have any program that is blocking video, or other program or antivirus, red alarm etc.
2) verify if camera working fine with the program it came and all drivers are installed.
3) verify if you install the new versio of Messenger, at www.microsoft.com and try configurating later on TOOLS , AUDIO AND VIDE SETTING.
4) Verify is the vide cam, are well connected inside ( any good tech can see if is working fine lines inside. )
Good Luck
Open Sky