Mic in msn messenger

Mic dont working in msn messenger on one not protected win xp comp.
can it depend's on some spywares or virs that able to attak msnger?
i was traing to reinstall "extern" and i uninstalled inbounded msn messenger.

in yahoo and skype mic working perfekt but in msnger no.
all settings is OK, good configured.

mic is combo with usb "logitech zoom" webcam

what and how can disable mic?
when i configured setting was evrything ok but when connecting, dont working.

is it exist some "3rd party" or some software that can remove and clean all msnger entries and files?

===this OS===
win XP home
today updated
no firewall or av installed or enabled and no proxy

Is it latest version 6.2 you are using as there may be some issues with updated windows and old version of messenger?

have you checked here:
http://messenger.msn.com/Help/

Quote:

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no firewall or av installed or enabled and no proxy

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may have nothing to do with your current problem but i would fix that first - google for

Outpost Firewall
and ACG antivirus

both good both free

v_Ln

make sure your video card drivers don't have a built in mixer program keeping your mic from working. some auto-mute the mic until you change it. Do a search for mixer

but i dont know... just guessing.