These issues can be solved by using system restore point. Tips to use this -

* Insert your Windows Vista or Windows 7 DVD and now restart the PC.
* The moment you received “Press any key to boot from CD or DVD” message, follow it.
* Now set the following preferences, and click next. Preferences are Language to install, Time and currency format, Keyboard or input method
* Now Click on Repair your computer, select the operating system that has to be repaired and then click Next.
* Click System Restore now and then click Next.
* Click the restore point which you want to use and then click Next.
* Now confirm the disk which you want to restore. Now click on Next.
* After following these steps, you may need to restart your PC.

Clicking on a restore point would allow you to successfully log on into your PC.

Note – after using system restore feature, you may need to reinstall few programs and it is also possible that some updates may be removed. tagheuerformula.