Welcome to Bleeping Computer.
I'm maranatha and I will be helping you.
First thing to do is read this and deside what you would like to do.
Once installed, backdoor Trojans can be instructed to send, receive, execute and delete files, collect confidential data and information from the computer, log activity on the computer and more.
This allows hackers to remotely control your computer, steal critical system information
and Download and Execute files
I would suggest you disconnect this PC from the Internet, change all passwords using a Non-infected computer (Not this one) and refrain from any credit card or financial dealings until clean. If you do any financial dealings with this computer Contact any credit card or banks for possible fraud on your account.
Because of backdoor functionality, many experts in the security community believe that once infected with this type of Trojan, the best course of action would be a reformat and reinstall of the OS. Please read these for more information:How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?When Should I Format, How Should I Reinstall
We can attempt to clean this machine but I can't guarantee that it will be 100% secure afterwards.
Should you have any questions, please feel free to ask.
Please let us know what you have decided to do in your next post.