J2ee 6.20 PL 25 start hangs

I installed the Portal from CD (51030419) and all installations where successfully. If I start the server, it hangs on Loading: ClusterManager ...

I also try to solve the problem with the Patch 25 but it doesn't work.

<b>Operating System:</b>

WindwosServer 20003

Standard Edition

Version 5.2

<b>Startup Window</b>

[OS: Windows XP] [VM vendor: Sun Microsystems Inc.] [VM version: 1.3.1_11-b02] [

VM type: Java HotSpot(TM) Client VM]

SAP J2EE Engine Version 6.20 PatchLevel 85851.20 is starting...

Loading: LogManager ...

Loading: SystemThreadManager ...

Loading: ThreadManager ...

Loading: TimeoutManager ...

Loading: MemoryManager ...

Loading: PoolManager ...

Loading: PolicyManager ...

Loading: IpVerificationManager ...

Loading: ClusterManager ...

... and nothing more happens.