Stay Away From Driver 388.59 on at least Windows 7.
This is on all BOINC GPU Projects and Folding@Home GPU WU.
Team Forum Thread: https://forums.evga.com/FindPost/2740388
I installed Driver 378.92 back on and all is Well.

Stderr output
<core_client_version>7.8.3</core_client_version>
<![CDATA[
<message>
Error performing inpage operation.
 (0x3e7) - exit code 999 (0x3e7)</message>
<stderr_txt>
<search_application> milkyway_separation 1.46 Windows x86 double OpenCL </search_application>
Reading preferences ended prematurely
BOINC GPU type suggests using OpenCL vendor 'NVIDIA Corporation'
Error loading Lua script 'astronomy_parameters.txt': [string "number_parameters: 4..."]:1: '<name>' expected near '4' 
Switching to Parameter File 'astronomy_parameters.txt'
<number_WUs> 5 </number_WUs>
<number_params_per_WU> 20 </number_params_per_WU>
Using AVX path
Found 1 platform
Platform 0 information:
  Name: NVIDIA CUDA
  Version: OpenCL 1.2 CUDA 9.1.104
  Vendor: NVIDIA Corporation
  Extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d9_sharing cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer
  Profile: FULL_PROFILE
Using device 0 on platform 0
Found 2 CL devices
Device 'GeForce GTX 1080 Ti' (NVIDIA Corporation:0x10de) (CL_DEVICE_TYPE_GPU)
Board: 
Driver version: 388.59
Version: OpenCL 1.2 CUDA
Compute capability: 6.1
Max compute units: 28
Clock frequency: 1670 Mhz
Global mem size: 11811160064
Local mem size: 49152
Max const buf size: 65536
Double extension: cl_khr_fp64
Error creating contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Error getting device and contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Failed to calculate likelihood
Using AVX path
Found 1 platform
Platform 0 information:
  Name: NVIDIA CUDA
  Version: OpenCL 1.2 CUDA 9.1.104
  Vendor: NVIDIA Corporation
  Extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d9_sharing cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer
  Profile: FULL_PROFILE
Using device 0 on platform 0
Found 2 CL devices
Device 'GeForce GTX 1080 Ti' (NVIDIA Corporation:0x10de) (CL_DEVICE_TYPE_GPU)
Board: 
Driver version: 388.59
Version: OpenCL 1.2 CUDA
Compute capability: 6.1
Max compute units: 28
Clock frequency: 1670 Mhz
Global mem size: 11811160064
Local mem size: 49152
Max const buf size: 65536
Double extension: cl_khr_fp64
Error creating contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Error getting device and contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Failed to calculate likelihood
Using AVX path
Found 1 platform
Platform 0 information:
  Name: NVIDIA CUDA
  Version: OpenCL 1.2 CUDA 9.1.104
  Vendor: NVIDIA Corporation
  Extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d9_sharing cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer
  Profile: FULL_PROFILE
Using device 0 on platform 0
Found 2 CL devices
Device 'GeForce GTX 1080 Ti' (NVIDIA Corporation:0x10de) (CL_DEVICE_TYPE_GPU)
Board: 
Driver version: 388.59
Version: OpenCL 1.2 CUDA
Compute capability: 6.1
Max compute units: 28
Clock frequency: 1670 Mhz
Global mem size: 11811160064
Local mem size: 49152
Max const buf size: 65536
Double extension: cl_khr_fp64
Error creating contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Error getting device and contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Failed to calculate likelihood
Using AVX path
Found 1 platform
Platform 0 information:
  Name: NVIDIA CUDA
  Version: OpenCL 1.2 CUDA 9.1.104
  Vendor: NVIDIA Corporation
  Extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d9_sharing cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer
  Profile: FULL_PROFILE
Using device 0 on platform 0
Found 2 CL devices
Device 'GeForce GTX 1080 Ti' (NVIDIA Corporation:0x10de) (CL_DEVICE_TYPE_GPU)
Board: 
Driver version: 388.59
Version: OpenCL 1.2 CUDA
Compute capability: 6.1
Max compute units: 28
Clock frequency: 1670 Mhz
Global mem size: 11811160064
Local mem size: 49152
Max const buf size: 65536
Double extension: cl_khr_fp64
Error creating contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Error getting device and contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Failed to calculate likelihood
Using AVX path
Found 1 platform
Platform 0 information:
  Name: NVIDIA CUDA
  Version: OpenCL 1.2 CUDA 9.1.104
  Vendor: NVIDIA Corporation
  Extensions: cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d9_sharing cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_nv_create_buffer
  Profile: FULL_PROFILE
Using device 0 on platform 0
Found 2 CL devices
Device 'GeForce GTX 1080 Ti' (NVIDIA Corporation:0x10de) (CL_DEVICE_TYPE_GPU)
Board: 
Driver version: 388.59
Version: OpenCL 1.2 CUDA
Compute capability: 6.1
Max compute units: 28
Clock frequency: 1670 Mhz
Global mem size: 11811160064
Local mem size: 49152
Max const buf size: 65536
Double extension: cl_khr_fp64
Error creating contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Error getting device and contextTrying to show unknown cl_int 999
 (999): Unknown cl_int
Failed to calculate likelihood
14:51:25 (4216): called boinc_finish(999)

</stderr_txt>
]]>

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Crunching@EVGA The Number One Team in the BOINC Community. Folding@EVGA The Number One Team in the Folding@Home Community.

I have to disagree, driver 388.59 running fine on this host:
https://milkyway.cs.rpi.edu/milkyway/show_host_detail.php?hostid=616064
with dual GPU GT 640 & GT 430 on Windows 7 professional 64 bit, latest patches. :?

---

Aloha, Uli

I have to retract my post from yesterday. :/
After install of the latest patches from yesterday evening, the system crashes with bluescreen in NVidia-DLLs. After reinstall of driver version 372.90 the system is running stable again.

Interestingly before the patch Tuesday the system was running normal with the latest driver... :?

---

Aloha, Uli

I have to retract my post from yesterday. :/
After install of the latest patches from yesterday evening, the system crashes with bluescreen in NVidia-DLLs. After reinstall of driver version 372.90 the system is running stable again.

Interestingly before the patch Tuesday the system was running normal with the latest driver... :?

I'm knocking on wood but the 388.69 driver seems to be working for me.