hey, sry no ones been able to help yet, so you just said u formated and installed ur OS right? and i just woke up too so im not fully thinking yet, but this happened before AND after you installed ur os again? This could be a virus in the memory or the front of the hard drive, you could try using kill disk, this writes 0's to every single part of your hard drive, so there is nothing left and sometimes not able to be recovered. You could try this and then install your operating system, warning, this will take a while depending on your hard drive size, i did it to my 76.6 GB hard drive and it took almost 3 hours. hope it helps