From your latest minidumps, your windows is still using the RealTek Sound card driver. You have to de-install RealTek Sound Card driver and install the sound card driver.
Mini123006-01.dmp had code corruption and it is the symptom of faulty ram.Mini122606-01.dmp is crashed with NT Status code 1d (ie illegal instruction) and it is also the symptom of hardware error. Probably the ram is bad. Run memtest to stress test the ram.
Mini122406-01.dmp BugCheck 100000D1, {44004, 2, 0, f6da1e33}
Probably caused by : RtkHDAud.sys ( RtkHDAud+65e33 )
Mini122406-01.dmp BugCheck 100000D1, {44004, 2, 0, f6da1e33}
Mini122406-01.dmp DEFAULT_BUCKET_ID: DRIVER_FAULT
Owning Process 864c1660 Image: WoW.exe
Mini122406-01.dmp Probably caused by : RtkHDAud.sys ( RtkHDAud+65e33 )
RtkHDAud.sys Wed Jun 28 16:25:18 2006 (44A23CEE)
Mini122406-02.dmp BugCheck 100000D1, {44004, 2, 0, f6909e33}
Mini122406-02.dmp DEFAULT_BUCKET_ID: DRIVER_FAULT
Owning Process 80562f00 Image: Idle
Mini122406-02.dmp Probably caused by : RtkHDAud.sys ( RtkHDAud+65e33 )
Mini123006-01.dmp BugCheck 1000008E, {c0000005, 805295da, ecb83550, 0}
Mini123006-01.dmp DEFAULT_BUCKET_ID: CODE_CORRUPTION
Owning Process 86734da0 Image: iexplore.exe
Mini123006-01.dmp Probably caused by : memory_corruption
Mini122406-03.dmp BugCheck 100000D1, {4, 2, 0, f6dc1e33}
Mini122406-03.dmp DEFAULT_BUCKET_ID: DRIVER_FAULT
Owning Process 8668bc68 Image: WoW.exe
Mini122406-03.dmp Probably caused by : RtkHDAud.sys ( RtkHDAud+65e33 )
Mini122606-01.dmp BugCheck 1000008E, {c000001d, bfabf219, b84f8a4c, 0}
Mini122606-01.dmp DEFAULT_BUCKET_ID: DRIVER_FAULT
Owning Process 84ea06f8 Image: WoW.exe
Mini122606-01.dmp Probably caused by : ati3duag.dll ( ati3duag+1b219 )
Mini011107-01.dmp BugCheck 100000D1, {8, 2, 0, 8}
Mini011107-01.dmp DEFAULT_BUCKET_ID: DRIVER_FAULT
Owning Process 852d6da0 Image: WoW.exe
Mini011107-01.dmp Probably caused by : RtkHDAud.sys ( RtkHDAud+5b112 )
RtkHDAud.sys Wed Jun 28 16:25:18 2006 (44A23CEE)