Hi Deepak ^_^,
Really sorry for the delayed response . Everyone seems to be busy with life. Anyways, I have analysed your dump files and they all blame the Intel Networking Driver except the latest one.
Attempt to reset the display driver and recover from timeout failed.
Arg1: ffffe00071d650a0, Optional pointer to internal TDR recovery context (TDR_RECOVERY_CONTEXT).
Arg2: fffff800dce397a0, The pointer into responsible device driver module (e.g. owner tag).
Arg3: ffffffffc000009a, Optional error code (NTSTATUS) of the last failed operation.
Arg4: 0000000000000004, Optional internal context dependent data.
So, it seems that the Display Driver (NVIDIA's nvldmmkm.sys) did not have enough resources to complete the task it was supposed to do.
6: kd> !error ffffffffc000009a
Error code: (NTSTATUS) 0xc000009a (3221225626) - Insufficient system resources exist to complete the API.
The other dump files blamed your Network Adapter.
Do one thing, disable the Network Adapter from Device Manager and monitor the system and see if it crashes or not. Also, check if you have any update in the Windows Update regarding this driver. My laptop is also old and most of the times, I find the driver update in Windows Update
You could also try uninstalling the Intel Network Adapter driver from the Device Manager and then restart the system to let Windows install the driver automatically.
Let me know how it goes ^_^.