Most software issues are very complicated and even if you do resolve them there is still a chance that it has already done damage to your operating system. In this case the easiest way to fix the problem is to format the hard drive all together. But formatting can be tough and the choosing the right drviers to install is even trickier and the entire process can take up more than 2 hours of your time. That doesn't include the time you have to spend installing the programs that came from the factory one disc at a time.
Good thing dell computers nowadays have have a factory image built in to the hard drives. If you can successfully access the factory image, you can restore your computer back to factory condition in just a little over 15 minutes, and you won't have to install the programs and drivers one at a time. The factory image will also automatically install programs and drivers that came from the factory. So in less then half an hour, you would have a working computer which is as good as you first got it.
How to access the factory image?
Visit this link:
DELL FACTORY IMAGE RESTORE
or contact Dell Technical Support.
I'll see if I can come up with a video post on how it's done, but no promises though. Cheers!