Build "hello world" example fails

Hello,

We have a problem here with the NIOS II 5.1.

After installing I tried to build the simple hello_world example and got the

following:# #####################################################

**** Incremental build of configuration Debug for project hello_world_0 ****

make -s all

Creating generated_all.mk...

c:/altera/quartus51//sopc_builder/bin/sopc_builder: not found

make: *** [C:/altera/kits/nios2_51/examples/verilog/niosII_cycloneII_2c35/standard/software/hello_world_0_syslib/Debug/system_description/../obj/generated_all.mk-t] Error 1

Build completed# #####################################################

In the NIOS error-log I found the following:# #####################################################

!SESSION Apr 11, 2006 14:42:43.119 ---------------------------------------------

eclipse.buildId=I200406251208

java.version=1.5.0_04

java.vendor=Sun Microsystems Inc.

BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=de_DE

!ENTRY com.altera.ide.core 1 0 Apr 11, 2006 14:42:43.119

!MESSAGE sh C:/altera/quartus51/sopc_builder/bin/sopc_builder --update_classes_and_exit --no_splash -s --projectpathC:/altera/kits/nios2_51/examples/verilog/niosII_cycloneII_2c35/standard

!ENTRY com.altera.ide.core 4 0 Apr 11, 2006 14:42:44.322

!MESSAGE Error occurred while updating SOPC Builder Cache. Launch SOPC Builder from Quartus II for more information.# #####################################################

We use Quartus II 5.1 and Windows XP SP2 german version.

Thanks in advance for any hint.