upon opening my external hard drive I found a file of 117G missing. The hard drive usage was the same as usual but the file was no longer listed. After I went through the rest of the drive I found that the original file had been placed into another unknown file. along with the my original file were these two programs? mrtstub.exe. & mrt.exe._p I ran both Bitdefender and Malwarebytes both showed no virus. I googled them and found contradicting views on whether they are virus or not. I also tried to delete them but was not able to. What are they, why did they hide my file in another. and how do I get rid of them?
am new to Windows 7 and not versed on how to do so.
Thanks for any help