Java web start will not load on my computer

When I try and start the IR (PI version 7.1) I get the download of Java Web Start aborting as it complains that the client.jar file is corrupt.
I just got a colleague to do the same thing on her computer and the dowload worked perfectly!
I have JRE 1.5.0.18 on my computer, my colleague has 1.6 on her machine.
HELP!
Ross Goodman

Hi Ross,
Perform the below step:
Integration Builder> Administration-> JAVA Web Start Administration--> Re-initialization and force signing.
This function will cause the above re-collection and additionally a re-signing of ALL resources with a dummy certificate. The original SAP signatures of the jarfiles will be lost. It is recommended to use this function only in test systems. To get back the original SAP signatures the application has to be deployed again.
Thanks,

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