Windows 7 keeps on writing thousands of jpg files on c:\windows\serviceprofiles\networkservice\appdata\local\microsoft\media player\art cache\localmls subdirectory as system files.

Let me describe what is happening. I used the "get info" in iTunes to add various jpg artwork at the individual CD level (i.e., selecting multiple song at the same time).  Itunes displays the artwork fine and works fine. Over a period of time I noticed system performance deterioration and when I tried to create a disk image using CMS Bounceback Ultimate noticed that the number of files on my hard drive had increase from 250,000 to approximately 1,000,000. After a lot of investigation and a little luck I determined that Windows 7 writes these jpg files repeatedly in the c:\windows\serviceprofiles\networkservice\appdata\local\microsoft\media player\art cache\localmls subdirectory. These are the same jpg files I added in iTunes. At the time of my discovery there were approximately 700,000 of these small files written in this subdirectory as system files which are hidden files. I was able to delete these files by first resetting the file attributes (attrib *.jpg -s -h -r) and then using the del command. Unfortunately, the system continues to write the same files in the same sub and within hours I have thousands of these files written again. I checked the system for viruses/malware using the latest versions of sophos, malwarebytes, and spy hunter. There is no malware reported by any of these programs.  I also stopped Sophos and tried again but problem continues. I also reconstructed the iTunes library using the steps described by Apple but this did not solve problem. Any suggestions what I can try next?