Sharing knowledge / Windows
Start command prompt, type: sfc /scannow , press Enter.
Start command prompt, type word: control, press Enter.
Start command prompt, type word: taskmgr, press Enter.
Start command prompt, type word: rstrui, press Enter.
Start command prompt, type word: shutdown -r, press Enter.
Power on computer, before Windows starts continuously keep pressing F8 button on the keyboard.
Check "Offline Windows Password and Registry Editor" at http://pogostick.net/~pnh/ntpasswd/ . Read manual, download image file, make bootable CD or USB Flash drive, boot computer from it, follow instructions.
This is not our solution
You could read about this problem in here: www.webtrickz.com. It did not work 100% for us.
Really worked - found in here www.iefaq.info, instructions in here http://social.answers.microsoft.com