In order to get rid of back door virus, you can either use your updated anti-virus programs to remove the malicious attack by backdoor virus or delete the corrupted files manually. This section is going to cover a few steps that you can take to manually delete the virus. However, this is only recommended for experts who are very comfortable with their system settings.  
  
SDBot.H Trojan
For any versions and editions of Microsoft Windows, you can follow the step below to delete

SDBot.H Trojan from your system:

• Click on Start and select Find or Search (depending on Windows version)
• Next, select Files or Folders or All Files and Folders
• On the dialog box that appears, type the name of the file such as I5Eexplore and search the hard drive
• Delete the file
• Click on Start->Run and type REGEDIT in the dialog box and click OK to open the registry editor
• Delete these entries in the Registry

"Config Loadatiorin"="<I5Eexplore.exe>"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce

However, be careful while deleting entries in the registries as removing the wrong entries can cause the computer to generate STOP errors while booting or operation issues.
Your final step will be to exit the Registry Editor and to restart the computer and check the Registry again for the Trojan virus!

Livup (msstart.exe) Trojan
If you have caught up with this virus and you are using Microsoft Windows XP, 2003, 2000, NT and ME, then the following steps can do wonders for you:

• Firstly, ensure that you have configured Microsoft Windows Explorer.  This provides a graphical user interface for accessing file systems.
• Next, click on Start and point to Settings->Control Panel and then click on Folder Options
• In the dialog box that opens, click on the View tab. This will display Advanced settings box from where you can uncheck or deselect the Hide protected operating system files
• Select the Show hidden files and folders and deselect the hide file extensions for unknown file types. Now, click on OK to save the changes
• Now, press Ctrl+Alt+Del keys and open Task Manager program. Click on Processes tab and find msstart.exe process. If it exists, select it and click End Process to kill it.
• Now, you can go to the folder of SystemRoot\Winnt\System32. Incase your Windows 2003/XP/NT or 2000 is on driver C: then you can use the folder C:\Winnt\System32. Now, you can find msstart.exe and directly delete it!

An alternative can be to search for all of msstart.exe files by using Windows Search feature and delete them all. If you are choosing to delete the backdoor virus manually, always take a backup of your computer. This always helps as at times you may end up deleting necessary files that may cause problems in your computer operations.

Ask PC Experts is a team of certified technicians who can assist you anytime in removing backdoor Trojans from your PC. Sign up for their incidental or annual plans and get advanced system protection! Ask PC Experts technicians can help you remove Trojan virus attacks through remote computer support.

This makes use of a downloadable URL on being registered for any one of the plans. Once this URL is downloaded, it activates a remote session at both ends. On the due completion of the service, the technicians log out of the session and you get your PC clean from Trojans.

For instant, fast and effective troubleshooting, get registered with Ask PC Experts and visit their website to check out their remote computer support methodology. You can also dial their tech support at toll free number 1-888-889-335 for quick assistance.