Java Win XP issues

I created some java applications and applets a couple of years back during a course I was doing at the time. I went to show someone the work I had done and for some reason it no longer works. I have java 1.4.1 installed which used to work fine but all of a sudden it no longer does. When running an application I know is correct a "java.lang.noclassdeffounderror message is generated.

Any Windows Updates that could have caused this issue?

I have run the same code on other win xp PCs and it works fine.

I have upgraded the version of java on my PC and still the same message is reproduced.

I have disabled my firewall and tried to execute the code with the same result.

I would appreciate any advice.

[738 byte] By [BrianEdwardsa] at [2007-10-2 10:16:49]