I use windows 7. I have a 1.5 Tb external HDD. It has about 400 Gb of data. I gave it to my friend because he wanted some movies n etc. When i got it back, i scanned it and found 3 trojans and 3 malwares. I moved them to my chest with my Avast. When i open my HDD. I see one setup of microsoft security essentials and nothing else. I have "show hidden files and folders" ticked in my folder options. In my computer my drive shows 0.99 Tb free of 1.36 Tb. I can access my files and folders through "run" but am not able to view them directly through F:\ .