rtwlanu.sys is from the Edimax AC1200 Wireless LAN USB adapter driver.
With USB network drivers, it is strongly recommended to keep the drivers up to date.
If there are no updates available, I suggest to not use the USB adapter while troubleshooting.
Code:
1: kd> lmvm rtwlanu
start             end                 module name
fffff800`91400000 fffff800`917b5000   rtwlanu  T (no symbols)           
    Loaded symbol image file: rtwlanu.sys
    Image path: \SystemRoot\System32\drivers\rtwlanu.sys
    Image name: rtwlanu.sys
    Timestamp:        Mon Feb 16 07:42:38 2015 (54E1915E)
    CheckSum:         0039A1D7
    ImageSize:        003B5000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
dfx12x64.sys is the audio driver for DFX Audio Enhancer.
Update the software of DFX Audio Enhancer.
Code:
1: kd> lmvm dfx12x64
start             end                 module name
fffff800`89c70000 fffff800`89c7a000   dfx12x64 T (no symbols)           
    Loaded symbol image file: dfx12x64.sys
    Image path: \SystemRoot\system32\drivers\dfx12x64.sys
    Image name: dfx12x64.sys
    Timestamp:        Tue Aug 28 21:10:34 2012 (503D17AA)
    CheckSum:         00010BD9
    ImageSize:        0000A000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4