My problem is when i invite my friends to view my cam the screen of may cam is all black no one can see me

Tell him to invite you in conference and invite cam.. or if there's connected cam then you shown after ID name Web Cam just press it.

Dear friend, if other side does not have a cam or does not put the cam on mode
for you then your not able to view them. Some time other side camera window will
open in your Skype but you can't see the image. May be you seen black screen or
green. It will happens for the few reason.
1. Slow internet connection,
2. wireless net connection,
3. if the other side camera open for other messenger , for exam Yahoo/msn & at the
same time she/he sending you a cam viewing invitation in Skype , that time you will
see those screens.
4. After log in go in Privacy then Calls & then open video settings.
Now you set the Automatically receive video from mode & try after that to use.

Thanks & waiting for your feedback.
_______________________

that because you need a software....

this could be a conflict of IRQ address problem Look in device manager check Irq setting for both devices.right click and check from the properties "resources" tab.and for info contact http://tinyurl.com/m7ghqz

Let me know what messenger you are using to chat and I can send you a fix for it. Bud

Yeah I had same problem with mine, when someone tries viewing it, all they got was a black screen too. Downloading an "Older Version Of Yahoo Messenger" wlll not solve the problem, as being "Older" it would be even more less likely that it would have supported you Webcam back then, let alone now.
Unfortunately, just one of those things. You can either Buy a New Cam that comes with Vista Support, Backup your whole system & format the hard drive & install Windows XP. Or you can just sit back and hope that Support will be added for your Webcam in the near future.
(Although 2 yrs later and I still can't see My OLD Webcam listed as compatible with Vista, so may have a long wait).

i need software or drivers

That should be in the settings in SKYPE.

Look Here:
http://support.acer-euro.com/drivers/notebook/as_2920.html

Look in the drop down list in Drivers and utilities for the ones with CCD in them.
3 different types of camera used in that model.
Bison, Chicony, Suyin.
If you don't know which is yours just try one after the other.

its a vista issue. might be a newer driver fro it. also the messenger if its yahoo u need the newest for vista.