2 BSOD- don't know what to do

Hi all,
i recently experienced 2 differents BSODs and i dont really know what to do. They seem to happen randomly, maybe noting for 2 days and then 2 in half an hour

My computer is an Acer aspiere 5742G
4Gb DDr3
Hitachi HTS545050b9a300 500GbHDD
Nvidia GeforceGT540M - 1 Gb
win 7 64bit SP1

Here are the minidump files


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