Can't run java at all

Hello!
I have a 600 megahertz Intel Pentium III machine running Windows 98 SE. I use the following browsers: Netscape 4.79, 6.2 and internet explorer 6.
I was able to run java applications on my computer very well. I purchased a program to make web buttons. The program worked very well for a time and it just stop working after a while. I contacted them and was told to upgrade my jvm machine by downloading the newest msjavx86.exe from microsoft and installing it to see if it will solve my problems. It did not work.
I get this message everytime that I try to use the program:
"Can't find the file "BtnAuthor.class" can't execute class "
I'm unable to run any java and all I see are grey boxes with codes. Any idea of what could be wrong or how to fix this problem.
Thanks for your time at reading this
Ann :-)

Well, I'm quite unfamiliar with this. I just opened the java console on netscape 4.79 (my favorite) and I got the following:
Netscape Communications Corporation -- Java 1.1.5
Type '?' for options.
Symantec Java! ByteCode Compiler Version 210.065
Copyright (C) 1996-97 Symantec Corporation
Then I pressed the "?" and got the following:
Netscape Communications Corporation -- Java 1.1.5
Type '?' for options.
Symantec Java! ByteCode Compiler Version 210.065
Copyright (C) 1996-97 Symantec Corporation
Netscape Java Console Commands:
b: break into the debugger (Windows only)
c: clear console window
d: dump applet context state to console
f: finalize objects on finalization queue
g: garbage collect
h: print this help message
l: capture all classes loaded by an applet to a directory
m: print current memory use to console
q: hide console
s: dump memory summary to "memory.out"
t: dump thread info to "memory.out"
x: dump memory to "memory.out"
X: dump memory (detailed) to "memory.out"
0-9: set applet debug level to <n>
I'm not sure if I should explore any of this options at this time. I have no idea of how to write a simple java on my own. The button program was supposed to do the writing and I was just supposed to paste it it in the html.
Thanks for helping me! :-)

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