Trouble Scanning with Malware Bytes Anti-Malware...?

Earlier tonight my girlfriend found signs of a virus on the computer. Normally I use Malware Bytes to scan the computer, however she began scanning it with Trend Micro. Since then I have paused the scan in Trend Micro to open and try to scan with Malware Bytes (because it is clearly a superior program). Anyway, long story short, I am able to open Malware Bytes, update the software, and update the database, however every time I try to scan with it it fools around for a minute or two while it says "Preparing for the scan..." before closing automatically. Although I think having Trend Micro open could have something to do with it, I believe I have had a Trend Micro scan paused and scanned the computer with Malware Bytes simultaneously before. Essentially what I'm wondering is, could Trend Micro be killing Malware Bytes or is it more likely that whatever has attacked the computer is killing it?

I've checked the scan logs and there is not really any information on what's happening other than the duration of the scan and the fact that it found no malicious programs.

Any help would be greatly appreciated.