What I would do is, borrow a known good working laptop EG (dual core 2.33Ghz, 4gb of ram), make sure there is plenty of free space on the HDD (C:\) something like 100gb free space.
Load/install VDJ, and put some or a good bunch of music files on a memory stick EG 8gb, then once all boted and installed the vdj and your all set,, start playing around for 4 or 6 hours mixing tunes, and see what happens, also just to be on the safe side get one of them laptop coolers with the fan built in, I have 3 laptops here and all of them have the fan built in to them, 2 of them i made, i have never ran into any heat issues, about one a month pop the trap door off and blow out the dust.
anyhow,
there will only be two out comes to doing this:
1. the poptop will work fine with no issues what so ever.
2. you still will have issues.
try that, and let us know.