I got a Dell desktop computer and it is windows 7 and wend I go to restart be for it goods to restart up it sides this Preparing to configure windows do not turn off your computer.

Windows 7 Startup Problems - How to Fix Windows 7 Startup Problems With Easy Tips

If you fail to boot the operating system, you can:
#1. Use Windows startup Disk to fix Windows 7 startup problem
If the failure of booting is result from the errors or the damaged files of starting system, a start up disk will help to solve this problem with ease.
#2. Use last know Good Configuration to fix Windows 7 startup problem
It is also a common method to enter the operating system. To use last know Good Configuration you can press F8 when you reboot the system. Then select "Last know Good Configuration" on the Advanced Boot Options screen to enter this mode.
#3. Use System Restore option in safe mode to fix Windows 7 startup problem
Enter the safe mode as the step in to last know Good Configuration in method #2. Choose System Restore option in System Tool in start menu.
If you find the startup process of Windows 7 very slow, we suggest that you should:
#1. Remove redundant programs in your booting items as many as possible. After finishing this action, the speed of startup can be improved by no less than 40%.
#2. Delete short cuts on desktop. The more icons on the desktop, the longer it takes to restart Windows 7. To fix Windows 7 startup problem, you should clear up the unnecessary short cuts on your computer desktop.
#3. Optimize registry regularly with proper registry maintenance tool. Registry error is the main reason that slows down the rebooting speed. You had better do registry cleanup timely to speed up Windows 7 start up process.