Still having trouble starting tomcat 5.0

Just after a fresh install of TC50 I receive

Using CATALINA_BASE: C:\TOMCAT5.0
Using CATALINA_HOME: C:\TOMCAT5.0
Using CATALINA_TMPDIR: C:\TOMCAT5.0\temp
Using JAVA_HOME: C:\DEVTOOLS\SUN\j2sdk1.4.1_02
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:112)
at java.util.jar.JarFile.<init>(JarFile.java:117)
at java.util.jar.JarFile.<init>(JarFile.java:55)
at org.apache.catalina.loader.StandardClassLoader.addRepositoryInternal(StandardClassLoader.java:981)
at org.apache.catalina.loader.StandardClassLoader.<init>(StandardClassLoader.java:200)
at org.apache.catalina.startup.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:238)
at org.apache.catalina.startup.Bootstrap.createClassLoader(Bootstrap.java:189)
at org.apache.catalina.startup.Bootstrap.initClassLoaders(Bootstrap.java:135)
at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:206)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:375)
Bootstrap: Class loader creation threw exception
java.lang.IllegalArgumentException: addRepositoryInternal: java.util.zip.ZipException: error in opening zip file
at org.apache.catalina.loader.StandardClassLoader.addRepositoryInternal(StandardClassLoader.java:995)
at org.apache.catalina.loader.StandardClassLoader.<init>(StandardClassLoader.java:200)
at org.apache.catalina.startup.ClassLoaderFactory.createClassLoader(ClassLoaderFactory.java:238)
at org.apache.catalina.startup.Bootstrap.createClassLoader(Bootstrap.java:189)
at org.apache.catalina.startup.Bootstrap.initClassLoaders(Bootstrap.java:135)
at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:206)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:375)