i just recently had this problem before, my desktop icons are resizing by themselves after a reboot from small size to medium size. even when i go through a folder and arrange the icons from list to medium view, when i reopen again, they come in list again. i then made a new user account, and it solved my problem, after a few days my antivirus was scanning my pc and it detected a trojan horse virus, from that point i got the same problem again. i think what it does it deletes some files from the shell folder and deletes from the bag folder which you find them in regedit, but i don't know for sure. i also downloaded a microsoft fix it, and does not works, it gives me an error, and also downloaded a program named shell folder fix, but nothing. please can someone help me out about this problem thanks.