Error starting Tomcat 6.0.13 on Windows XP SP2

Hi everyone, this is my first post.

I'm not really new to java, however i'm having some trouble getting Tomcat to work.

Downloaded and installed:

j2sdk-1_4_2_15-windows-i586-p

I installed both sdk and jre. set JAVA_HOME to C:\j2sdk1.4.2_15 (default installation path). java -version works on command prompt.

I then installed Tomcat, either setting the java path to "C:\j2sdk1.4.2_15" and "C:\Program Files\Java\j2re1.4.2_15".

Every time i try to start Tomcat i get:

[2007-07-25 20:08:38] [442 javajni.c] [error] FindClass org/apache/catalina/startup/Bootstrap failed

[2007-07-25 20:08:38] [997 prunsrv.c] [error] Failed loading main org/apache/catalina/startup/Bootstrap class C:\Program Files\Apache Software Foundation\Tomcat 6.0\bin\bootstrap.jar

[2007-07-25 20:08:38] [1260 prunsrv.c] [error] ServiceStart returned 3

any help?

[899 byte] By [gremo1982a] at [2007-11-27 11:44:05]