Windows 7 hangs in startup

Windows 7 hangs in startup

Hi,

Link to URL.

My response: Hello Tom Thank you for writing to Microsoft Forums. Classpnp.sys is the driver for SCSI devices. Due to this Classpnp.sys your computer hangs at the "Starting Windows" screen.

This problem may occur in many scenarios. These scenarios include the following:

• The registry is corrupted.
• A System file is missing or damaged.
• A device driver file is missing or damaged.

You need to do a Startup repair and system restore from DVD to fix this issue. Please follow these steps Startup repair. To resolve this problem, use the Startup Repair tool. The Startup Repair tool can fix some problems that prevent the operating system from starting correctly. You can run the Startup Repair tool by using Windows 7 installation disk or by using the computer's preinstalled recovery options. 

• Insert the installation disk.

Note The computer must be configured to start from a CD or from a DVD. For information about how to configure the computer to start from a CD or from a DVD, see the information that came with the computer.

• Restart the computer. To do this, click Start, click the arrow next to the Lock button, and then click Restart. Note If you cannot restart the computer by using this method, use the power button to turn off the computer. Then, turn the computer back on. 
• Set your language preference, and then click Next. Note In most cases, the startup repair process starts automatically, and you do not have the option to select it in the System Recovery Options menu. 
• Click Repair your computer. 
• In the System Recovery Options dialog box, click the operating system that you want to repair, and then click Next. 
• In the System Recovery Options menu, click Startup Repair to start the repair process. 
• When the repair process is complete, click Finish. 

To run the Startup Repair tool if the computer has preinstalled recovery options, follow these steps to use the Startup Repair tool.

Note: In most cases, the startup repair process starts automatically. Follow these steps only if Startup Repair does not start automatically.

• Remove all floppy disks, CDs, and DVDs from the computer, and then restart the computer.

Follow one of these steps:

• If the computer has a single operating system installed, press and hold the F8 key as the computer restarts. You must press the F8 key before the Windows logo appears. If the Windows logo appears, you must restart and try again.
• If the computer has more than one operating system, use the arrow keys to select the operating system that you want to repair. Then, press and hold F8. 

• In Advanced Boot Options, use the arrow keys to select Repair the computer, and then press ENTER. 
• Click a keyboard layout in the list, and then click Next. 
• Click a user name in the list, enter the password, and then click OK. 
• In the System Recovery Options menu, click Startup Repair. 

• When the repair process is complete, click Finish. Note The problem may not be resolved after the Startup Repair tool runs one time. If the problem is not resolved when the computer restarts, follow the steps again. Reference link.

Systems restore: Please follow these steps to do system restore

• Insert the Windows Vista or Windows 7 DVD, and then restart the computer.
• When you receive the following message, press any key: Press any key to boot from CD or DVD.
• Set the following preferences, and then click Next:
• Language to install.
• Time and currency format.
• Keyboard or input method.
• Click Repair your computer, select the operating system that you want to repair, and then click Next.
• Click System Restore, and then click Next.
• Click the restore point that you want to use, and then click Next. Note Click a restore point that will return the computer to a state where the log on is successful. After you use the System Restore feature, reinstall any programs or updates that may be removed.
• You will not lose any personal documents. However, you may have to reinstall programs. You may also have to reset some personal settings.
• Confirm the disks that you want to restore, and then click Next.
• Click Finish, and then click Yes when you are prompted.
• When the System Restore process is complete, click Restart to restart the computer. 

After the computer restarts, click Close to confirm that the System Restore process has finished successfully. Reference link.

Once you boot to the desktop, you need to update all the drivers to the latest versions available.

Hope it helps.

Thanks and Regards.