Chronic BSOD's need analysis when u can

This is an older eMachine T6216 that has run Win7 for several years now, but which is now bluescreening regularly. I thought it might have to do with the Windows stock sound driver so updated to Realtek which gets a warning for known incompatibility, but either driver performs the same.

Last week the BSOD's shut me out and a quick google pointed to memory, so I started Memtest which found a failure in first pass but not in subsequent passes, then the BSOD's subsided for awhile as though the memtest had somehow helped. Confounding.

Perfmon reports a driver malfunctioning but I cannot find it in Device manager and it is unclear as to what exactly it is except that it's plug and play. Using USB keyboard and mouse.

Thank you for your analysis.

Old drivers are causing these BSODs

The old(2005) Realtek HD Audio driver seems to be the cause, it should be updated
Realtek

Code:

RtkHDAud.sys        0x91407000    0x917d2000    0x003cb000    0x43043a25    18/08/2005 11:35:01

Update the Conexant Modem Driver
eMachines Support - Downloads & Support Documents

Code:

HSX_CNXT.sys        0x8d822000    0x8d8d7000    0x000b5000    0x4995deb5    14/02/2009 00:57:25                
HSXHWBS2.sys        0x8c79a000    0x8c7e6000    0x0004c000    0x4995def3    14/02/2009 00:58:27                
HSX_DPV.sys        0x8d667000    0x8d769000    0x00102000    0x4995df61    14/02/2009 01:00:17

If newer drivers are not found the devices should be disabled/uninstalled

so I started Memtest which found a failure in first pass but not in subsequent passes,

Seems like a RAM problems/incorrect RAM settings in BIOS