I have installed java on my machine and then i installed derby,  but i can't start with "ij", can you please explain me the problem i have.
I have included in this mail, the steps i followed to install derby.

C:\Users\welcome>cd ..

C:\Users>cd ..

C:\>set JAVA_HOME=C:\"Program Files"\Java\jdk1.7.0_04

C:\>set PATH=%PATH%;%JAVA_HOME%\bin

C:\>java -version
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b22)
Java HotSpot(TM) 64-Bit Server VM (build 23.0-b21, mixed mode)

C:\>set DERBY_INSTALL=C:\"Program Files"\Apache\db-derby-10.8.1.2-bin

C:\>set CLASSPATH=%DERBY_INSTALL%\lib\derby.jar;%DERBY_INSTALL%\LIB\derbytools.j
ar;

C:\>java org.apache.derby.tools.sysinfo
Error: Could not find or load main class org.apache.derby.tools.sysinfo

C:\>echo %CLASSPATH%
C:\"Program Files"\Apache\db-derby-10.8.1.2-bin\lib\derby.jar;C:\"Program Files"
\Apache\db-derby-10.8.1.2-bin\LIB\derbytools.jar;

C:\>cd "Program Files"

C:\Program Files>java org.apache.derby.tools.ij
Error: Could not find or load main class org.apache.derby.tools.ij

C:\Program Files>cd ..

C:\>cd %DERBY_INSTALL%\bin

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>setEmbeddedCP.bat
Files"\Apache\db-derby-10.8.1.2-bin"=="" was unexpected at this time.

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>@if "C:\"Program Files"\Apache
\db-derby-10.8.1.2-bin"=="" goto noderbyhome

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>java org.apache.derby.tools.sy
singo
Error: Could not find or load main class org.apache.derby.tools.sysingo

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>java org.apache.derby.tools.sy
sinfo
Error: Could not find or load main class org.apache.derby.tools.sysinfo

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>java org.apache.derby.tools.ij

Error: Could not find or load main class org.apache.derby.tools.ij

C:\Program Files\Apache\db-derby-10.8.1.2-bin\bin>

--
rajagopal