Had a look through your dumps and all report error 0xA
BSOD Index
All but one of the dumps blame driver vfilter.sys for the crash which is part of the VPN software your using, the driver is dated before Windows 7 was released so may not be 7 compatible, recommend you update or remove VPN client and replace
You have some old drivers on your system i would recommend updating or removing these, i looked a few of them up for you
GVTDrv64.sys 05/09/2006
Gigabyte mobo driver (not sure for what)
RivaTuner64.sys 17/07/2007
seehcri.sys 09/01/2008
Sony ericsson driver
s0016cr.sys 24/04/2008
Not sure about these
s0016wh.sys 24/04/2008
Not sure about these
s0016cm.sys 24/04/2008
Not sure about these
AODDriver.sys 13/10/2008
Part of AMD overdrive software
vfilter.sys 16/01/2009
Part of VPN software
Hope this helps