diff --git a/lib/classes/device_installer.py b/lib/classes/device_installer.py
index be5b14b6..1ebe5527 100644
--- a/lib/classes/device_installer.py
+++ b/lib/classes/device_installer.py
@@ -455,10 +455,32 @@ class DeviceInstaller():
         # ============================================================
         elif has_working_cuda() and (has_nvidia_gpu_pci() or is_wsl2()):
             version_out = ''
+            msg = ''
             # 1) CUDA RUNTIME detection
             try:
                 import ctypes
-                libcudart = ctypes.CDLL("libcudart.so")
+                libcudart = None
+                if os.name == "nt":
+                    # Native Windows: CUDA runtime is a DLL
+                    for dll in (
+                        "cudart64_130.dll",
+                        "cudart64_121.dll",
+                        "cudart64_120.dll",
+                        "cudart64_118.dll",
+                        "cudart64_117.dll",
+                        "cudart64_116.dll",
+                        "cudart64_115.dll",
+                    ):
+                        try:
+                            libcudart = ctypes.CDLL(dll)
+                            break
+                        except OSError:
+                            pass
+                else:
+                    # Linux + WSL2
+                    libcudart = ctypes.CDLL("libcudart.so")
+                if not libcudart:
+                    raise OSError
                 version = ctypes.c_int()
                 if libcudart.cudaRuntimeGetVersion(ctypes.byref(version)) == 0:
                     device_count = ctypes.c_int()
@@ -468,7 +490,9 @@ class DeviceInstaller():
                             major = v // 1000
                             minor = (v % 1000) // 10
                             version_out = f"{major}.{minor}"
-            except Exception:
+                        else:
+                            msg = f'Runtime present ({version.value}) but no devices'
+            except (OSError, AttributeError):
                 pass
             # CUDA TOOLKIT detection (fallback only)
             if not version_out:
@@ -493,11 +517,11 @@ class DeviceInstaller():
                                     version_out = f.read()
                                 break
             if not version_out:
-                msg = 'CUDA runtime detected but NVIDIA CUDA Toolkit not installed.'
+                if msg == '':
+                    msg = 'CUDA runtime detected but NVIDIA CUDA Toolkit or Runtime not installed.'
             else:
                 version_str = toolkit_version_parse(version_out)
                 cmp = toolkit_version_compare(version_str, cuda_version_range)
-
                 if cmp == -1:
                     msg = f'CUDA {version_str} < min {cuda_version_range["min"]}. Please upgrade.'
                 elif cmp == 1: