Hiya, i'm not the most technical user but I've been reading this forum recently to understand about Windows 7 and I've come across this problem. I hope someone can help me. I recently iinstalled Windows 7 on my girlfriends laptop. I finally got round to installing a couple of programs on her computer I thought she should have (anti-virus, some add on's etc.) and then on to installing Daz Loader to authenticate Windows, everything went okay and Daz prompted me to restart. I restarted and came up with a boot screen, the boot screen said this: Code: Windows Boot Manager A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. If you have a windows installation disc, insert the disc and restart your computer. Click 'Repair your computer," and then choose a recovery tool. Otherwise, to start Windows so you can investigate further, press the ENTER key to display the boot menu, press F8 for advanced boot options, and select Last Known Good. If you understand why the digital signature cannot be verified and want to start windows without this file, temporarily disable driver signature enforcement. File: \windows\system32\winload.exe Status: 0xc0000428 Info: Windows cannot verify the digital signature for this file. ENTER=Continue ESC=Exit It'd be great if someone could offer me some advice, I tried 'H' in "The official windows 7 repository" to no avail. Thankyou.