Spelling is important. It enabled two practically same name applications to co-exist and remain distinct, even by name. The story is about Defence Center, which name is pronounced in the same way as that of Defense Center. Please take notice of different endings in the first word of their names to see that these are actually different words and, consequently, different programs.
Defence Center is deemed to be a malware that gives rise to another malware family, while Defense Center, which had been detected approximately in three months before it, was just another clone of notorious scamware family.
Get rid of Defence Center as it is a hostile software that wants you to pay for hoax. Its alerts may be partially true when they warn you of inability of certain software to run, but the total truth is that it is the adware that disables legitimate entries to scaring purpose.