JAVAC IS NOT RECOGNIGED AS AN EXTERNAL OR INTERNAL COMMAND OPERABLE PROGRAM OR BATCH FILE''

It is not correctly installed.
It is not accepted a windows command, so is not in the windows path, which is why you are getting the error.

try restarting the laptop and before anything pops up on the screen hit the f8 key and the boot menu comes up then start in last configuration that worked and see if it helps

If you are getting that error, it means that eitherJava is not installed, or is not in your path. 
If Java is not installed, go to http://www.java.com to install the most recent version of the JRE. 
If you're sure you have already installed Java ensure the Java executable is in your system's path. You can do this by first finding the directory it is installed in. For example, mine is installed in C:Program FilesJavajre6. The executables are located in the bin directory. 
In order to set your path (Assuming Windows Vista), go to Start -> Control Panel -> System, then click on the 'Advanced System Settings' link on the left, then the 'Environment Variables' button. In the lower section (Labeled 'System Variables'), scroll through and find the item labeled 'Path' and double click it. In the field labeled 'Variable value' go to the end and add a semicolon (;), and then the path your installation of Java is located. Using the example I gave above, I would have added ;C:Program FilesJavajre6in to the end of the line. 

The procedure for 64-bit Windows Vista or Windows 7 is the same, except the text you will add to the Path variable is ";C:Program Files (x86)Javajre6in". Notice there is still a semi-colon at the beginning of the line. 

Once you have done this, you will need to close and reopen the command prompt if it is already open, and you should be able to run java without getting this error message.

remove battery and internal battery and after 15 min install all back it will reset bios

javac is the JavaCompiler, You've downloaded the Java Runtime. You need to download the SDK, which includes javac.
http://java.sun.com/javaee/downloads/index.jsp

Hi,

You need to type:

If it's a program.class

java program

or of it's a program.jar

java -jar program.jar

regards

javac filename.java to compile and java filename to execute

The main cause of this error is you havent set the environment variables correctly, you can do it as follows

Right click on "My Computers" select properties the click "Environment variables" then under "User variables for pcname"

select new and add the following paths

1)var name:path
var value:C:\Java\jdk1.5\bin

2)var name:classpath
var value:C:\YourJavaCodeDirName

click ok and its done

in batch programming you can use your DOS command internal/extarnal or any program you can run.

You have to just write your commands in the sequence in which you want to run them, in a text format, and save them with a extension of .BAT. Thats all you have to do in a batch file program.

Click on this link to see some examples from Micro Soft:

Please don't forget to rate this........ :)

Thanks
Iqbal

1) to edit registry go to start / select run and type regedit. from there you are able to edit registry values. BEWARE because editing registry values may make your windows stop working. you should know what you are doing and you are responsible of the cosnequenses 2) a bat file is a batch file. Batch files are files that allow MS-DOS and Microsoft Windows users to create a lists of commands and/or programs to run once the batch file has been executed. 3) create a file called autorun.inf and type inside [autorun] open=file.exe save your file and write it in the cd you want to autorun the file.exe part must be replaced with the executable you want to load when your CD autoruns