java.lang.ClassNotFoundException:com.ncr.teradata.TeraDriver error

Could someone help me with this error as soon as possible.I am trying it from last 2 days,but can't solve it.

I tried intiliazing driver,but didn't work.

Driver driver = null;

try{

driver = (Driver)Class.forName(applicationproperties.getProperty("TD_T4_DRIVER")).newInstance();

}

even if I try w/o reading it from file and wire it:

driver = (Driver) Class.forName("com.ncr.teradata.TeraDriver").newInstance();

still doesn't work,gives me same error..

Plz help me,I have to get it done by today..

Many Thanks in Advance!!'

-ASH

[603 byte] By [ASH_2007a] at [2007-11-27 9:47:24]