Hi aa and welcome to the forums
We will need some more details, to start:
- What version of 7 are you installing?
- Are you upgrading or doing a clean install? If upgrading, how did you start it (from within Vista or booting from DVD)?
You listed your laptop model but if you could fill in the details in "My system specs" it will allow members to look into that without having to go to the Dell page. You can use SIW | System Information for Windows by Gabriel Topala
Finally, please look into Questions to use for help with Installation Issues
We might be needing to ask many of those questions to find out what the problem is, so if you can provide advanced info that will help it go faster