i was arested and charged with afelony drug charge in1998.im now trying to rent an apartmentfor me and my 91 year old mom and myself harris county tx.

Whether you can have the case expunged depends on how it was resolved. If you were arrested, charged, plead guilty, and received a final felony conviction, you cannot do anything with it. It is there, forever.  If the case was dismissed outright or after successful completion of deferred probation, you may be eligible to have the records expunged or sealed, depending on your specific circumstances.