diff --git a/desktop/main.cjs b/desktop/main.cjs
index dc8a7f7..477ac59 100644
--- a/desktop/main.cjs
+++ b/desktop/main.cjs
@@ -23,8 +23,9 @@ function runtimeRoot() {
 }
 
 function dataDirectory() {
-  const base = process.env.LOCALAPPDATA || app.getPath('userData')
-  return path.join(base, 'PicHost', 'data')
+  return app.isPackaged
+    ? path.join(path.dirname(process.execPath), 'data')
+    : path.join(__dirname, '..', 'data')
 }
 
 function findFreePort() {
diff --git a/electron-builder.yml b/electron-builder.yml
index e8cd2dc..014e2a4 100644
--- a/electron-builder.yml
+++ b/electron-builder.yml
@@ -29,6 +29,7 @@ nsis:
   oneClick: false
   perMachine: false
   allowElevation: true
+  include: packaging/windows/installer.nsh
   allowToChangeInstallationDirectory: true
   createDesktopShortcut: true
   createStartMenuShortcut: true
diff --git a/packaging/windows/installer.nsh b/packaging/windows/installer.nsh
new file mode 100644
index 0000000..ed5a124
--- /dev/null
+++ b/packaging/windows/installer.nsh
@@ -0,0 +1,61 @@
+!include "LogicLib.nsh"
+
+!ifdef BUILD_UNINSTALLER
+  Var /GLOBAL PicHostDeleteData
+!endif
+
+!macro customInstall
+  CreateDirectory "$INSTDIR\data"
+  ${If} $installMode == "all"
+    nsExec::ExecToLog 'icacls "$INSTDIR\data" /grant *S-1-5-32-545:(OI)(CI)M'
+  ${EndIf}
+!macroend
+
+!macro customUnInstall
+  StrCpy $PicHostDeleteData "0"
+  ${IfNot} ${isUpdated}
+    ${IfNot} ${Silent}
+      MessageBox MB_YESNO|MB_DEFBUTTON2 "是否删除 $INSTDIR\data 中的 PicHost 数据？$\r$\n$\r$\n选择“否”将保留数据库、图片、视频和备份。" IDYES PicHostDeleteDataYes
+      Goto PicHostDeleteDataDone
+      PicHostDeleteDataYes:
+        StrCpy $PicHostDeleteData "1"
+      PicHostDeleteDataDone:
+    ${EndIf}
+  ${EndIf}
+!macroend
+
+!macro customRemoveFiles
+  StrCpy $R1 "$INSTDIR\..\PicHost-data-backup"
+
+  ${If} $PicHostDeleteData == "1"
+    RMDir /r "$INSTDIR\data"
+  ${Else}
+    IfFileExists "$INSTDIR\data\*.*" 0 PicHostDataHandled
+    IfFileExists "$R1" 0 PicHostMoveData
+      MessageBox MB_ICONSTOP "无法保护现有的 PicHost 数据，已取消卸载。"
+      Abort
+
+    PicHostMoveData:
+      ClearErrors
+      Rename "$INSTDIR\data" "$R1"
+      IfErrors 0 PicHostDataHandled
+        MessageBox MB_ICONSTOP "无法将 PicHost 数据移动到安全位置，已取消卸载。"
+        Abort
+
+    PicHostDataHandled:
+  ${EndIf}
+
+  SetOutPath "$TEMP"
+  RMDir /r "$INSTDIR"
+
+  ${If} $PicHostDeleteData != "1"
+    IfFileExists "$R1\*.*" 0 PicHostDataRestoreDone
+      CreateDirectory "$INSTDIR"
+      ClearErrors
+      Rename "$R1" "$INSTDIR\data"
+      IfErrors 0 PicHostDataRestoreDone
+        MessageBox MB_ICONEXCLAMATION "PicHost 已卸载，但数据保留在：$\r$\n$R1"
+
+    PicHostDataRestoreDone:
+  ${EndIf}
+!macroend