@Ricky
Oh.. I see. I think I'll format and installing fresh OS.
Thanks for your explanation.
Hope you can help me get my account back.
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Added after 3 Hours 29 minutes:
Oh Sh*t. The hacker is still annoying me. I'm already change my email password but then he reset my email password again.
What should I do ?
@ Dirtyminder: Are we here to babysit your Gmail, your password and your other personal details? It is YOUR job to secure your details, period.