I hv yahoo 10 but am not able to activate video calling or even pc to pc calling. how do i start them?

What exactly is a Flash 10 crash and what causes it in your computer? This problem irritates us a lot especially the videos on various multimedia web sites crash. Although Flash 10 is the latest plug-in to play videos and other multimedia content but due to some errors and conflicts users all over the world are encountering frequent Flash 10 crashes in their PCs. There are, however, some proven ways to fix this problem.
You might have tried running the Flash plug-in with other browsers. Sometimes it happens that the plug-ins work fine with one browser and malfunction in the second. The same goes with this latest Flash player by Adobe.
If you are getting a Flash 10 crash in all the browsers then this problem can be fixed by following these steps:
> Run registry repairing scan to fix active-x. file associations and other registry errors which are largely behind the Flash 10 crashes in the computer. Using an effective registry cleaning tool is very helpful to fix this problem.
> It may be the case with you that your browser and the Flash player are having compatibility issues. It is very important to fix these conflicts in order to fix Flash 10 crash. After repairing registry you shall uninstall the Flash Player 10.
> Use the Adobe official guide to uninstall the current Flash player installed in your computer.
> After uninstalling it, install some other version of Flash such as Flash Player 9. You may try other versions as well and choose the one which works best for you.
> Updating of the sound drivers is also helpful to end Flash Player 10 crashes. To update your sound drivers follow these steps:
* Right-Click on My Computer icon > Properties > Hardware > Device Manager
Find the sound card device and note down its name. Update and reinstall the drivers for this device by visiting the manufacturer web site.
The above guidelines allow you to fix Flash 10 crash. If you are looking for a quick fix of the solution and do not have the time to follow all the tips, you should try RegInOut free fix report to stop

For video calling both parties have to have Messenger 10
For webcam chats your contact can have an earlier version than you
To initiate the video chat click the webcam icon
For webcam > Actions > More Actions - Invite to view

First of all you have to set up your webcam
Plug in your webcam and visit this site - Hit 'Allow' in the top window and check your cam in the left hand panel.
Do not proceed if the camera fails to work here, but concentrate on your webcam software / drivers

http://www.testmycam.com/

Having proved your cam is working ,you can configure it to Yahoo Messenger 10.

COMPATIBILITY WITH YAHOO MESSENGER

You MUST use Internet Explorer to visit this page, with your webcam plugged in, to check compatibility and automatically download the latest webcam control. Make sure your webcam broadcasts on this page before moving on

http://help.yahoo.com/l/us/yahoo/messenger/messenger10/webcam/mstacamtest.html

CONFIGURE SOFTWARE
Its good practice to disconnect and re-connect your webcam before you start - if you have been using it elsewhere the Yahoo software may have difficulty in locating it. Mine, I just unplug it from the USB and plug it back in, if yours is integral with the computer you will have to re-start the computer, use a keyboard shortcut or disable / enable the webcam from the Device Manager.
Of all the chat programs, Yahoo is the most painful software to set up but if you follow these instructions you should be ok.

INTERNET CONNECTION
Webcam connected
Open messenger - on top toolbar. Left click ( > ) Messenger > Preferences > Connection - Select 'no proxies' or 'connect direct to the internet' depending on the version of messenger you have
make sure your internet connection and country are correct in the lower two boxes > Apply > OK

TESTING
> Messenger > My webcam - the warning panel will launch, click 'OK' and your webcam will start. You should be rewarded at this stage with your happy smiling face.

SET WEBCAM DEFAULT
With webcam still running > Messenger > Preferences > Webcam Broadcast > Camera Source - set your webcam as default using dropbox. > Camera Settings - adjust settings to suit. > Apply > OK
Take a note of any additional software, if you have multiple choice for Camera Source, you may wish to uninstall any redundant webcam software later to prevent conflicts

AUDIO
Open Video and Voice - run through your default equipment and make a test call - click OK

PERMISSION OPTIONS
> Messenger > Preferences > Webcam - make your default equipment selections and who you will allow to view you > Apply > OK

IN USE
When you are both on line and wish to show your webcam > Actions > 'Invite to view my webcam'.
Messenger 10:- > Actions > More Actions > invite to view my webcam. This will launch an invitation on your contacts screen when they 'Accept' your webcam broadcast will start- There can be considerable time lag ( +1 minute) before they see you, so don't be too impatient ( You can check the status on the bottom left of your webcam panel. You can 'drag and drop' the frame to a convenient location by grabbing the top border.

Your contacts may need to configure their connection the same as INTERNET CONNECTION above (Ignoring webcam connected) if they get a "webcam not connected" message

Sometimes you may have to broadcast the 'small image' option from the 'Webcam' menu on the top of your image frames. This happens when one of you is down on resources -its like sending a large photo by email - its quicker if you cut the size down
you can zoom up to 200% from the same menu when the webcam picture comes through

Use the 'Always on top' option from the 'webcam' menu - or your image will disappear under the message window when you type a message