What I do when I find an unknown program or file being opened at boot is use
Google.com to find out what it is. In this case, I got a hit here:
http://www.answersthatwork.com/Tasklist_pages/tasklist_u.htm which said:
Trojan virus program which masquerades as a supposed "USB Monitor"
program. The deception has been so successful that many sources on the web
genuinely believe that this task alerts the user when a USB device has been
plugged in. It does nothing of the sort : in fact, one of its unwanted
side-effects on many PCs that we have found the program on, is that it
actually makes the PC unbearably slow as soon as specific types of USB
devices are plugged in. There are different versions of this program, some
of them clearly communicating with some servers out on the Internet, and we
have found one or two to download other Trojans and viruses. Crazily, in
our experience this program seems to come on the [usually not required]
installation CDs of generic brands of card readers. Before you get worried
about the card reader you have just bought, this is in no way an indication
that you have bought a bad card reader, but it is an indication that the
manufacturers of the card reader did not do a good quality assurance check
on the software which comes on the included CD (and which they in most
cases will have sourced rather than written themselves).
If the file is being started at boot, you will probably have trouble
deleting it unless you do a selective startup. I'd also wonder why your AV
program is not identifying the Trojan.