The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the vsserv.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.
The process known as BitDefender Security Service or Bitdefender Security Service or The Shield Deluxe (version 2009 Security Service) or The Shield Deluxe Security Service or Defender Pro Security Service
belongs to software BitDefender (version 10, 9, 9 Professional Plus, 11, 8, 2009, 9 Standard, 9 Internet Security, 2010, 8 AntiVirus +) or BitDefender Virus Shield or BitDefender Antivirus Plus (version v10) or BitDefender Internet Security (version 2011) or BitDefender Antivirus (version v10, 2009, 2008) or BitDefender Total Security (version 2011, 2009, 2010, 2008) or Bitdefender Internet Security (version 2015, 2013, 2012) or The Shield Deluxe (version 2009, 2010) or Bitdefender Total Security (version 2015, 2013, 2012) or BitDefender Free Edition (version v10, 2009) or Bitdefender Antivirus Plus (version 2015)
by SOFTWIN S.R.L (www.softwin.com) or BitDefender S. R. L (www.bitdefender.com) or Bitdefender (www.bitdefender.com/) or PCSecurityShield (www.pcsecurityshield.com) or Defender Pro.
Description: Vsserv.exe is not essential for the Windows OS and causes relatively few problems. Vsserv.exe is located in a subfolder of "C:\Program Files" (mostly C:\Program Files\Softwin\BitDefender8\ or C:\Program Files\BullGuard\).
Known file sizes on Windows 8/7/XP are 462,848 bytes (30% of all occurrences), 335,872 bytes and 74 more variants.
The program is not visible. It is not a Windows system file. The program listens for or sends data on open ports to a LAN or the Internet. It can change the behavior of other programs or manipulate other programs. Vsserv.exe is able to hide itself. Therefore the technical security rating is 75% dangerous, however you should also read the user reviews.
If you encounter difficulties with vsserv.exe, you can also ask Customer Support to assist you, update  the program or uninstall the associated program (Start > Control Panel > Add/Remove programs > BitDefender Total Security or BitDefender Antivirus).
Recommended: Identify vsserv.exe related errors
If vsserv.exe is located in a subfolder of C:\, the security rating is 62% dangerous. The file size is 389,120 bytes (44% of all occurrences), 462,848 bytes, 335,872 bytes, 385,024 bytes or 446,464 bytes. It can change the behavior of other programs or manipulate other programs. The program is not visible. The software listens for or sends data on open ports to a LAN or the Internet. The file is not a Windows system file. Vsserv.exe is able to hide itself.
External information from Paul Collins:
Important: Some malware camouflages itself as vsserv.exe. Therefore, you should check the vsserv.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
A clean and tidy computer is the key requirement for avoiding problems with vsserv. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the vsserv.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.