my T60 experienced random Vista Stop error 0x0000001A

[jlingo]

Memory_management error.

Does anyone here have experienced this? It is a fresh install Vista. I have tested the RAM and also didn't report any errors.
Recently, I also noticed when my laptop is hot, whenever I tried to boot up it would hang on the Vista green bar state and froze.
I had to let my laptop cool and then it would boot properly.
However, I have checked with tpfancontrol it is only around 70C at most.
I would appreciate any advice.

Thank you