[v-2mimat]

Did you install a new driver or piece or hardware. If so. boot to safemode. Click on start then run. type in sigverif. When it pops up click on advanced. Then click the radio button that says "look for other files that are not digitally signed". Then click browse and select the folder :\windows\system32\drivers. Click "OK" twice. Then click start. It will scan and tell you if any files are not signed (which may be the new ones that is causing the error) and then rename them with a .old extension- Then try to boot into windows.