[UPX] file removal

I originally had the ggf.exe coming up messing with my computer. I have installed avast and ran that things appeared to be working fine and dandy however when I restarted my computer I noticed avast picked up a few library files...file names are not totally correct as I am at my work computer right now which I know I know is a no no but here is the vast majority...

C:\WINDOWS\system32\pyo(forget the rest of this name).dll\[UPX]
the other one is similar however different name in the "pyo"section above.

These UPX files as I understand are a symantec issue where I had symantec at one point in time but no longer have it as my license lapsed and figured was useless without up to date definitions. Anyhow these are the only two trojans that avast is picking up. Avast won't allow me to delete them and I can not find these on my computer when searching. I have attempted to go into safe mode and that fails I can not even find these in registry when doing a search which I am not even sure that is where UPX files are located. Now if I can find these files can I delete them or would it be wise...if I can not find these files what are my options or what can anyone suggest?

Thanks for your help in advanced as this is a bugger of a bug.

 

adding to message below...I guess UPX files are compressed .exe files so that you can have multiple executables or something to that effect either way I want these things gone if at all possible when I get home I will get the direct locations but honestly my best efforts have failed to find these [UPX] files on my computer any suggestions would be great.