First of all, I remember reading on a forum long time ago about these files, but I do not remember the solution! They started showing up again after I did a fresh install, when I purchased my new system.
The files name format is in {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} and they all have common header of
Žù[”éqèBºÉR°.yût. Also, they are all less than 4k in size. When I googled the header a Portugal forum came up but google could not translate it.
I have been using Norton, MalwareBytes, SUPERAntiSpyware, and online sanners since day one and nothing! Nothing ever showed up on my old system either!