As filburt1 began to say:

You compile your java source files "GuestBook01.java" with the java compiler "javac.exe"

C:\javac GuestBook01.java

which creates
GuestBook01.class

Then run it with java.exe and without the ".class" extension
java GuestBook01

If you haven't set the CLASSPATH environment variable to C:\WINNT\Profiles\Administrator\Desktop\jdbc;, then your line was almost correct (but you used java.exe not javac.exe)
C:\javac -classpath C:\WINNT\Profiles\Administrator\Desktop\jdbc; GuestBook01.java

Exception in thread "main" java.lang.NoClassDefFoundError: GuestBook01/java
Since java.exe looks to execute a class file, the class file you specified was not found.