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Java Error - Java.lang.classnotfoundexception


I just purchased a new dell inspiron notebook and was trying to open a chat for school when i was prompted to download java. I did so and tried to open the chat again, but was unsuccessful. I googled "java" downloads for windows 7 thinking the link i followed was possibly outdated. Found a new link and downloaded it. I have windows 7 home premium 64 bit on my computer. Even though it says the download was successful i am still unable to get the chat to open and i have an error message that i have posted below. Thanks for any help. I am not computer savvy at all. And my dell warrantly only covers hardware problems. And i am just guessing that this could be related to windows 7. ?

Java plug-in 1. 6. 0_18
Using jre version 1. 6. 0_18-b07 java hotspot(tm) client vm
User home directory = c:usersstefanie
-
C: clear console window
F: finalize objects on finalization queue
G: garbage collect
H: display this help message
L: dump classloader list
M: print memory usage
O: trigger logging
Q: hide console
R: reload policy configuration
S: dump system and deployment properties
T: dump thread list
V: dump thread stack
X: clear classloader cache
0-5: set trace level to
-

Load: class blackboard. Plugins. Chat. Ui. Lw chat not found.
Java. Lang. Classnotfoundexception: blackboard. Plugins. Chat. Ui. Lwchat
At sun. Plugin2. Applet. Pplet2classloader. Findclass(unknown source)
At java. Lang. Classloader. Loadclass(unknown source)
At java. Lang. Classloader. Loadclass(unknown source)


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