From your dump I can see your nvidia drivers are from 2009. You can get the latest driver from here if your problem continues after updating the driver please post back with any new dmp files. http://duckduckgo.com/?q=percits
I updated my nvidia driver, and I still got a blue screen yesterday while hibernating my computer. A new .dmp file was not created, however. Any other thoughts about what may be causing this from the previously attached .dmp?
The Bsod does it happen when going or coming from Hibernate? You could try disabling Hibernate. Rebooting and then re enabling it. Before that though can you post your .dmp files.
Another thing do you have a fingerprint reader on the machine as the driver PBADRV.sys Mon Jan 07 18:52:14 2008 is from before the release of Windows 7. You can probably get the update from Dell.
Could you post the Spec of the machine please. Just thought how I've seen this happen before and a bios update fixed it.