Beeping from pc with msn?

[denisey]

This has just started today its mainly when one of my
contacts it chatting to me the tower beeps once?!!!! Why
is this happening? xp pro, no virus's etc thank you

 

[denisey]

-----Original Message-----
This has just started today its mainly when one of my
contacts it chatting to me the tower beeps once?!!!! Why
is this happening? xp pro, no virus's etc thank you
.
Think lve sorted it put my system sounds back to windows

default!