Problem In Export

[ah_maksoud]

hi members
i have a problem as i instal oracle at my COMPUTER and i work in a project i want to export the database of these project but an error is appear to me
i write these line in the dos to export the database

exp ahmed/ahmed file=d:\database.dmp owner=ahmed

and these error appear to me

EXP-00056: ORACLE ERROR 12560 ENCOUNTERED
ORA-12560: TNS:PROTOCOL ADAPTER ERROR
EXP-00000: EXPORT TERMINITED UNSUCCESSFULLY

I WANT TO KNOW WHAT TO DO TO EXPORT THE DATA
NOTE : I INSTAL ORACLE FORMS ON MY COMPUTER ALSO

[جلال شواقفه]

صديقي لديك مشكله باعدادات الشبكه والله اعلم
هل لديك domain ?
وهل الIP DHCP ?