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#11
I would not turn Windows Updates off - you need the security updates and the issue you have is likely not caused by them. You may have OS corruption which we should troubleshoot first.
Again a frequent fix for the Disk Check loop is to run Disk check from the Win7 DVD or Repair CD Command line: Disk Check
Try running SFC -SCANNOW Command.
If it finds corruption run it several times to see if it can fix the files. If not consider a Repair Install
using the Win7 installation DVD which you may have gotten along with your Dell, or you can start looking for now to borrow from a friend or other source. You may need to uninstall SP1 to run the Repair Install.
If this fails then I would strongly consider running Dell Factory Recovery from its partition: Dell Restoring Your Computer´s Software to the Factory Settings.
Be sure you have the Recovery Disks or make/order them as a backup.
Or you can use the Win7 Installation DVD to clean reinstall following these steps to get a perfect reinstall unburdened by all of the factory preinstalled bloatware: Reinstalling Windows 7