the computer has rebooted from a bugcheck

[Altera06]

Hi all

in the past 2 days my computer has been rebooting itself
as you can see in the following event :

the computer has rebooted from a bugcheck
The bugcheck was: 0x100000d1 (0x0000008b, 0x00000002, 0x00000001, 0xb30bea08). A dump was saved in: C:\WINDOWS\Minidump\Mini021407-01.dmp.

can someone please tell me why is it happening?

minidumps are attached...

 

[cpc2004]

Faulty ram??

Your windows is crashed without pattern and this is the symptom of faulty ram. Run memtest to stress test the ram.

Mini010807-01.dmp BugCheck 100000D1, {14, 2, 0, f87179c6}
Probably caused by : Cdfs.SYS ( Cdfs!CdCheckForDismount+82 )

Mini010907-01.dmp BugCheck 100000D1, {14, 2, 0, f87179c6}
Probably caused by : Cdfs.SYS ( Cdfs!CdCheckForDismount+82 )

Mini020307-01.dmp BugCheck 100000D1, {1014, 2, 0, f7eb5f82}
Probably caused by : ALCXSENS.SYS ( ALCXSENS+57f82 )

Mini021307-01.dmp BugCheck 1000008E, {c0000005, bf8022c1, b10c6c74, 0}
Probably caused by : win32k.sys ( win32k!xxxInternalGetMessage+d )

Mini021407-01.dmp BugCheck 100000D1, {8b, 2, 1, b30bea08}
Probably caused by : symidsco.sys ( symidsco+23bfc )