If you encounter "BSOD : DllRegisterServer failed with the error code 0x80040201" pop-up, your PC may have been infected by an ad-supported program, malware or spyware. It is wise to try all the means to get rid of them from your PC soon. Usually, it comes bundling with free programs or applications that are shared on the Internet. What's more, if you have visited malicious websites, you may get your PC infected as well. Sometimes, junk email attachments may contain computer threats, too. To avoid this circumstance, it is wise to keep a powerful antivirus on your PC. Meanwhile, learning more knowledge of computer security is necessary.