RE: Dell Inspiron 1545 - Blue screen error in Windows 7
The easiest way to identify on what is causing the Bluescreen would be running applcations like Bluescreenview
Once the application is installed, it would be able to retrieve / read the minidump files that are created whenever the system runs into a BSOD. If you have trouble reading those files.
open the start menu and type run, then press enter.
This would bring up the run command box. There type minidump and press enter. If possible compress those files into a rar archive and share it on the thread so that I can analyze the files and let you know whats causing it.