Need help with built-in iSight on XP ...

I'm running Windows XP Home Premium (32-bit, SP3) on my Intel iMac. What I need help with is getting the built-in iSight to run with a H.323-compatible videoconferencing program, such as Netmeeting. The iSight does work within Windows Explorer as an USB video imaging device; however, it doesn't activate when I use Netmeeting or Sorenson EnVision SL (a program used by deaf people to videoconference with other deaf people, such as myself). My question is, can I get the iSight to work as a webcam within XP, and if so, how? Thanks in advance; would really appreciate an answer ...

*bump* Can someone please help me out here ... ? Still haven't gotten any replies. Thanks.

Thanks for your help, but this is not what I need. What I need is to know if I can use the built-in iSight camera on my Mac within a Windows environment, and have it work with Netmeeting much in the same way that, say, an external webcam would (e.g. a Logitech or Creative Labs webcam). I've tried looking all over for an answer, but nothing so far. Someone please help ... Thanks!