diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
index bb50a409f5b..220ccca5999 100644
--- a/.github/actions/setup/action.yml
+++ b/.github/actions/setup/action.yml
@@ -119,6 +119,12 @@ runs:
         brew update
         brew install autoconf autoconf-archive automake bash ccache coreutils llvm@20 nasm ninja pkg-config qt unzip wabt
 
+    - name: Install Qt (Windows)
+      if: ${{ inputs.os == 'Windows' }}
+      uses: jurplel/install-qt-action@v4
+      with:
+        modules: "qtmultimedia"
+
     - name: 'Set required environment variables'
       if: ${{ inputs.os == 'Linux' && inputs.arch == 'arm64' }}
       uses: actions/github-script@v7
diff --git a/AK/Singleton.h b/AK/Singleton.h
index b1a0d5527f9..0dbba482597 100644
--- a/AK/Singleton.h
+++ b/AK/Singleton.h
@@ -12,9 +12,6 @@
 #ifdef AK_OS_WINDOWS
 // Forward declare to avoid pulling Windows.h into every file in existence.
 extern "C" __declspec(dllimport) void __stdcall Sleep(unsigned long);
-#    ifndef sched_yield
-#        define sched_yield() Sleep(0)
-#    endif
 #else
 #    include <sched.h>
 #endif
@@ -57,7 +54,11 @@ public:
             }
             // Someone else was faster, wait until they're done
             while (obj == (T*)0x1) {
+#if defined(AK_OS_WINDOWS)
+                Sleep(0);
+#else
                 sched_yield();
+#endif
                 obj = obj_var.load(AK::memory_order_acquire);
             }
             if constexpr (allow_create) {
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93283e7a81a..afcc5bf2658 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,7 +62,7 @@ if (ANDROID AND ENABLE_QT)
     set(ENABLE_QT OFF CACHE BOOL "" FORCE)
 endif()
 
-if (ENABLE_QT AND ENABLE_GUI_TARGETS AND (NOT WIN32 OR NOT ENABLE_WINDOWS_CI))
+if (ENABLE_QT AND ENABLE_GUI_TARGETS)
     set(CMAKE_AUTOMOC ON)
     set(CMAKE_AUTORCC ON)
     set(CMAKE_AUTOUIC ON)
@@ -74,7 +74,7 @@ find_package(OpenSSL REQUIRED)
 
 include(CTest) # for BUILD_TESTING option, default ON
 
-if (ENABLE_GUI_TARGETS AND (NOT WIN32 OR NOT ENABLE_WINDOWS_CI))
+if (ENABLE_GUI_TARGETS)
     add_subdirectory(Services)
     add_subdirectory(UI)
 endif()
diff --git a/CMakePresets.json b/CMakePresets.json
index f6687412e3f..f23c9794c05 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -145,8 +145,7 @@
       "displayName": "Windows CI Config",
       "description": "CI Windows build",
       "cacheVariables": {
-        "ENABLE_WINDOWS_CI": "ON",
-        "ENABLE_QT": "OFF"
+        "ENABLE_WINDOWS_CI": "ON"
       }
     },
     {
diff --git a/Libraries/CMakeLists.txt b/Libraries/CMakeLists.txt
index 568b08d1461..b24ccb4d277 100644
--- a/Libraries/CMakeLists.txt
+++ b/Libraries/CMakeLists.txt
@@ -24,6 +24,7 @@ if (ENABLE_GUI_TARGETS)
     add_subdirectory(LibImageDecoderClient)
     add_subdirectory(LibMedia)
     add_subdirectory(LibWeb)
+    add_subdirectory(LibWebView)
 endif()
 
 # FIXME: Increase support for building targets on Windows
@@ -36,5 +37,4 @@ add_subdirectory(LibLine)
 if (ENABLE_GUI_TARGETS)
     # FIXME: TCPServer still needs to be implemented on Windows
     add_subdirectory(LibDevTools)
-    add_subdirectory(LibWebView)
 endif()
diff --git a/Libraries/LibJS/Token.h b/Libraries/LibJS/Token.h
index 9b490d0c32a..ac9f18460a7 100644
--- a/Libraries/LibJS/Token.h
+++ b/Libraries/LibJS/Token.h
@@ -10,6 +10,7 @@
 #include <AK/Utf16FlyString.h>
 #include <AK/Utf16String.h>
 #include <AK/Variant.h>
+#include <LibJS/Export.h>
 
 namespace JS {
 
@@ -175,7 +176,7 @@ enum class TokenCategory {
     Identifier
 };
 
-class Token {
+class JS_API Token {
 public:
     Token() = default;
 
diff --git a/Libraries/LibWebView/CMakeLists.txt b/Libraries/LibWebView/CMakeLists.txt
index e6382b86f75..508a771a701 100644
--- a/Libraries/LibWebView/CMakeLists.txt
+++ b/Libraries/LibWebView/CMakeLists.txt
@@ -93,6 +93,10 @@ if (ENABLE_QT)
     set_target_properties(LibWebViewQt PROPERTIES AUTOMOC ON AUTORCC OFF AUTOUIC OFF)
     find_package(Qt6 REQUIRED COMPONENTS Core)
     target_link_libraries(LibWebViewQt PUBLIC Qt::Core)
+    if (WIN32)
+        find_package(pthread REQUIRED)
+        target_include_directories(LibWebViewQt PRIVATE $<BUILD_INTERFACE:${PTHREAD_INCLUDE_DIR}>)
+    endif()
     target_link_libraries(LibWebViewPlatform INTERFACE LibWebViewQt)
 elseif (APPLE)
     add_library(LibWebViewCocoa STATIC
diff --git a/Libraries/LibWebView/ProcessManager.h b/Libraries/LibWebView/ProcessManager.h
index a4c63821100..7ac283b1940 100644
--- a/Libraries/LibWebView/ProcessManager.h
+++ b/Libraries/LibWebView/ProcessManager.h
@@ -42,7 +42,7 @@ public:
 private:
     Core::Platform::ProcessStatistics m_statistics;
     HashMap<pid_t, Process> m_processes;
-    int m_signal_handle { -1 };
+    [[maybe_unused]] int m_signal_handle { -1 };
     Threading::Mutex m_lock;
 };
 
diff --git a/Meta/CMake/targets.cmake b/Meta/CMake/targets.cmake
index d4881dde3be..c605a9947b7 100644
--- a/Meta/CMake/targets.cmake
+++ b/Meta/CMake/targets.cmake
@@ -5,7 +5,11 @@ function(lagom_generate_export_header name fs_name)
     # to export symbols required by external consumers. This allows the codebase
     # to gradually slowly migrate instead of an all-or-nothing approach.
     if (NOT WIN32)
-        add_cxx_compile_options(${name} PRIVATE -fvisibility=hidden)
+        target_compile_options(${name}
+            PRIVATE
+                "$<$<COMPILE_LANGUAGE:CXX>:-fvisibility=hidden>"
+                "$<$<COMPILE_LANGUAGE:C>:-fvisibility=hidden>"
+        )
     else()
         set_target_properties(${name} PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS OFF)
     endif()