My desktop background became solid black colors and can only select from solid colors. Even if I select image it still shows solid color and thumbnail of image in win7/personalization does not work. (look at image 1 below) another problem all folder, video and image thumbnails dont work (look at image 2 below) and some of folder sometimes shows black square on it (look at image 3 below) All these happened after taking word document from usb my flash drive. Because those word documents are distorted in another computer and their extension was .scr and i assume this may cause all these. but I use Eset Smart Security 5 and no warning and after I scanned pc in safe mode with Kaspersky 2012 and it found nothing. I tried Malwarebytes and Spybot - Search & Destroy. I also tried Combofix 4-5 times and it deleted some file but problems are still present please help me I want to solve problems without formatting.. My system: Windows 7 Home Premium (Activated, not a copy license) Nvidia Geforce 9600 GS driver is updated.