I believe it is hardware problem. As a minidump is crashed with bugcheck code 12 and one minidump has NT Status code 90. They are related to hardware problem. Probably the ram or PSU is faulty,
Refer
this problem
Mini021808-08.dmp BugCheck 100000D1, {b8300c24, 2, 0, b66aba38}
Probably caused by : USR_MDMV.sys ( USR_MDMV+8da38 )
Mini021808-09.dmp BugCheck 100000D1, {35adfc4c, 2, 0, b6644a38}
Probably caused by : USR_MDMV.sys ( USR_MDMV+8da38 )
Mini021908-01.dmp BugCheck 1000008E, {c0000090, b04e67ec, bacd7d04, 0} <--- ??? c0000090
Probably caused by : USR_MDMV.sys ( USR_MDMV+3f7ec )
Mini021908-02.dmp BugCheck 10000012, {2, 8001003b, 0, 0} <----- Faulty PSU or RAM
Probably caused by : Unknown_Image ( ANALYSIS_INCONCLUSIVE )