|You didn't mention whether this was a desktop or laptop., or what model the Dell was. |
In most cases like this it is caused by bad hardware such as memory or external attachments printers and other USB devices still attached during installation.
Remove all but the necessities when installing the software....this means all extra memory.dvd/cd drives, harddrives and the likes. Then try to re-install the operating system...once it is installed then reinstall the removed items.