If you aren’t able to open Task Manager, try performing a Startup Repair.
If it’s been several minutes and Windows still hasn’t loaded, try disabling your video drivers.
If anything is found, reboot your computer and run the scan again after quarantining the items.
If Safe Mode will not work, try a Startup Repair.
Open your web browser. Visit the driver download page for your graphics adapter. You’re likely using either Intel, AMD, or NVIDIA. If you aren’t sure, just try the auto-detection software for each one. Run the auto detection tool on the driver site to scan your computer and retrieve the proper files.
If you can’t open this menu, you can boot from a Windows 7 installation DVD or USB installation drive and select “Repair computer” from the Setup menu.
If Startup Repair prompts you to perform a System Restore, click the Restore button and select the most recent restore point.
If you still are unable to boot into Windows, you may want to consider performing a clean installation. This will delete all of the data on the drive, so use Safe Mode to back up any important files first if possible.