I have read ur Problem though i m not a expert but still as a devotee of Krishna i suggest that if i could have been @ ur place then my steps would be:
1) every morning Blow counch which shld first keep in the feet of Krishna !!!
2) Use of Dhoop Sticks
3) Play Hanuman Chalisa thrice in a day in a music system
4) Try to get water of Gangaji sprinkle it at night & morning
5) If the Ghost resides in ur house then keep idol of Hanumanji whereever u feel it is !!!!
6) If it comes only in night time in front of ur door place Ganpati or hanumanji idol above the door.
7) Just go for a Ghra shanti Havan it is a MUST!!!
And Last but not the Least
HAVE FULL FAITH ON KRISHNA JUST CALL HIM FROM THE BOTTOM OF UR HEART HE WILL SURELY HELP YOU I GUARANTEE THAT As U KNOW HE IS BHAKTHVATSAL