If I got you right you have a Dell? Which model?
Dells have a long history of some models with DPC latency issues. You can see a big spike after 1 to 5 secs. That spike is what causes this lockup. My friend had an XPS and I did every trick possible to fix it. He just ended up selling it ...
I am sorry if this is your case but it is a motherboard issue... use the DPC latency checkerand see if you have a big spike
http://www.thesycon.de/deu/latency_check.shtml
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