Something wierd came up into my system, This is how it goes, I plugged in my USB flash disk, then copied a file. I tried to eject it after, but it would'nt respond to the "safely remove hardware". Plus, I could'nt even delete files from my Flash disk, the system always says that the device is still in use, but i already closed the files realted to the flash disk. Then, I restarted my computer with the Flash disk still plugged in the USB drive, after the system has started up, I tried to open "My Computer", to my surprise the system diaplayed the "installing" window, I tried to open other programs but the "installing" window just kept on reappearing. And I still could'nt delete the files from my flash disk nor "safely remove" it from the system. My colleages also experinced this kind of problem. I tried to scan the whole system including the flash disk with norton antivirus (updated) and mcafee viruscan (updated) but no virus or threats were found. Please help me put in dealing with this Flash disk problem. I also think that the files which are copied into the Flash disk are immidiately infected, and once the infected files are transferred into the system, the whole system is immidiately affected. I don't know any other effects/symptoms of this "problem", ahh, lastly, It makes the system perform quite sluggish. thanks for your future replies. :) blabidi