Welcome to Bleeping Computer, koreanguy!
pokapoka76.exe is associated with "EliteBar Adware", so to remove it here is what you need to do:First:
Read the Preparation Guide found HERE
. It is very important that you follow ALL of the instructions found within. Second:
Post your system information along with a brief description of the problems you are having, and your Highjack This! log in the Highjack This! forum found HERE
You are in good hands! But remember, the volunteers who work that forum are very busy, so please be patient and wait for a response. It can sometimes take a few days.