FileRep = File Reputation, is likely in this case to be as having a poor File Reputation. But FileRepMalware is still a poor file reputation, though I don't know if it would directly be malware.
That out of the way, regular defragmentation of a HDD shouldn't be required, so much so as to install a program. There is also a defragmentation function in Windows 10 (I can't recall what OS you are using) and may also be available in earlier versions.