I started cleaning one of my drives last night and found a shared directory called "maintemp". After checking the contents, I tried deleting it and was informed it was a system folder and that I could just forget removing it (I am paraphrasing at this point).
The directory structure of this folder is: maintemp/*user*/start menu/programs
*user* is the primary user setup on the computer. The programs directory has shortcuts in it. I deleted all the shortcuts but could not remove any folder (all are system folders). At a command prompt I could change the attributes of all the folders and remove all BUT the maintemp.
Rebooted to Safe Mode Command Prompt and was able to remove the maintemp directory. Did not show up in Safe Mode (using My Computer). Rebooted to Normal Mode. Entire maintemp directory structure was recreated (with the exception of the shortcuts in the programs directory).
Did not find any reference to maintemp in the registry and Hijack didn't reveal anything that just popped up and said, "Hi, I'm the offender, shoot me!"
It's not hurting anything, but it's irritating.