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The Inspiron 6400 was offered with a choice of three IntelCore 2 Duo Processors; the T5600, T7200, and T7400. The T5600 offered 1.83Ghz, with a 2MB L2 Cache. The T7200 offered 2Ghz, and the T7400 offered 2.16GHz of processing speed. Both the T7200 and the T7400 featured a 4MB cache. I'm sure the T7200 will work, likely the T7250 but no guarantee
I had this issue Call dell and tell them to replace your CPU as it has gone bad. This blue screen happends in this exact model because of the line of cpu's they put in where from a bad line. Call Dell you be glad you did.
The reason they told your daughter that is because either there isn't a powerful enough CPU and enough memory to support it and also there are no vista drivers for that laptop on Dell's website.
If you decide to put vista on that laptop your going to need to make sure that whatever hardware drivers vista doesn't detect, you'll need to search on the net to find vista compatible drivers if they are out there, it will be time consuming.
My recommendation from my own experience, make sure you have at least a 2GHz processor and 1GB or memory.