Anyone’s PC or computer can be attacked by backdoor Trojan. If you can see that your computer is behaving weirdly and you have figured out that some malicious activity is happening on your computer, you can immediately take a few actions that may save your files from further damage:

Disconnect your Internet connection
Most of the malicious or virus attacks activities take place over the Internet. It is best to disconnect or disable our network connection and physically remove the cables and phone lines to ensure complete disconnection. 

Scan your PC from a live CD
If your computer has had a virus attack, there is no point of running an anti-virus scan from your hard disk as the virus may not allow it to run properly. Use your anti-virus live CD to scan your computer or you can also avail online support from Ask PC Experts to rescue your PC from further infections.

Back up and restore your data files
It is always a good practice to back up all your files that are important for your usage on storage devices such as CDs, DVDs, USBs and tape drives. Before restoring your files back onto the computer, run an anti-virus scan on the directories of your computer to check the directories for existing viruses.  

Re-install your Windows operating system
If you have had made a note of your system settings and have your data back up, then reinstalling your operating system can help to a great extent. Re-installing your operating system will refresh your hard drive from corrupt or infected files. You can also re-install your anti-virus updated patches to secure your PC for future attacks.  

Dial Tech support for further assistance
If you have attempted every measure to save your Pc from brutal backdoor Trojan attacks and are yet facing major issues, it is best to call up PC specialists who are certified virus removal experts. Ask PC Experts tech support can be reached at any time and anywhere. Their virus removal technicians are available 24*7 and they offer flexi-plans on yearly and incidental basis that suit your needs. You can visit their website to check out their plans for individuals and small businesses or for instant recovery from backdoor Trojan attack, just dial their toll free number at 1-888-889-335.
Some other preventive measures suggested by Ask PC Experts that you must always take while using your PC are as under:

Use an updated Firewall
Firewalls can be hardware or softwares that scrutinize the incoming or outgoing data in a network. Personal firewalls, if configured properly with the assistance of Ask PC Experts can help prevent backdoor Trojan attacks, identity thefts, hacking, phishing scams and other cyber threats.

Update your anti-virus program 
Regular updations of your anti-virus programs can help you keep your system well protected. There are certain patches of your anti-virus program that on being installed, they tend to fill in the loop holes that your operating system is possessing. 

Avoid opening unsolicited e-mail and attachments from unknown sender
Never open spam or unsolicited e-mail as they carry links or URLs to infectious websites. Even avoid opening an attachment that has been sent to you by an unknown sender and has double extensions such as .jpj.exe. For sure such attachments are nothing but a Trojan virus.