Just Right click on MyComputer After clicking u will see a Frame in frame there
is a option Advanced just click on it.

in Advanced there is a button named Environment Variables just Click on this .

After clicking u will see another Frame will Appe...

then Go to System variables then select Path afther this click on edit button.

the another Box Will appe...... in the secont field if something in this field
then put ;

this and after it put your java  Path ok.

then just simple click on ok ok ok.