After booting up my laptop and before the Windows login screen I get a screen which pops up. I have to press the OK button on this screen before the Wondows login screen will appear. The screen has a square outline with the filename in the top left corner and an OK button on the bottom of the screen - the center of the square is blank. The script before the file name is squares and lines which look like bar code. The file name which appears at the end of the script is always a dll type file and seems to be different each boot up. When I search on the file names the files are always related to Windows. These are the file names from the last three times I booted up. xpob2res.dll, wuaueng.dll, mprapi.dll. What do I need to do to get rid of this screen?