built in webcam XPS one desktop problems

i  have purchased a XPS one desk top and cant get the built in webcam to work with the windows live messenger.

i called dell and they wanted me to pay to have someone from the SOFTWEAR  team to assist..

they say there is a conflict between dell softwear the microsoft softwear??

i called microsoft and they say they are not aware of any problems..

i seen on the forum that some people have the same problems??

has anyone got any ideas for a work around..

i have tryed installing a stand alone webcam but the computer keeps finding the dell built in webcam..

anyone any suggestions..

cheers

kinv