Spark stalling when joining conference

I am having an issue with the spark client. I have a user who whenever he tries to join a conference, Spark stalls on him. He has to go into the task manager and stop the program. Does anyone have any ideas what might be causing this?

Please let me know if any further information is needed.

Thank you,

Please could you provide us with your OS version, Java runtime version and Spark logs. (They are into your spark installation folder into folder logs)

Here is the information you requested.

Os: XP Pro serviec pack 3

Java Version: 5.0.16

Error Log:

java.lang.reflect.InvocationTargetException
Exception on commit = java.io.IOException: Can’t find registry file
Exception on commit = java.io.IOException: Can’t find registry file
Exception on commit = java.io.IOException: Can’t find registry file
Exception on commit = java.io.IOException: Can’t find registry file

Output Log:

DirectSound Capture Supported = true
DirectSoundAuto: Committed ok
JavaSound Capture Supported = true
JavaSoundAuto: Committed ok
Service listing
Publish-Subscribe service-result
Socks 5 Bytestreams Proxy-result
Broadcast service-result
User Search-result
Public Chatrooms-result
Initialized
1
1
Initializing…Resolved
Failed to commit to JMFRegistry!
Looking for Audio capturer
DirectSound Capture Supported = true
DirectSoundAuto: Committed ok
Finished detecting DirectSound capturer
JavaSound Capture Supported = true
JavaSoundAuto: Committed ok
Finished detecting javasound capturer