diff --git a/build.sh b/build.sh
index 85ea553..92be48e 100755
--- a/build.sh
+++ b/build.sh
@@ -10,7 +10,6 @@ generate() {
 	cp conf/rttys.crt conf/rttys.key output/$dir
 
 	[ "$os" = "windows" ] && {
-		cp conf/rttys.ini output/$dir
 		bin="rttys.exe"
 	}
 
diff --git a/conf/rttys.ini b/conf/rttys.ini
deleted file mode 100644
index 41b9c45..0000000
--- a/conf/rttys.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[login]
-username = rttys
-password = rttys
diff --git a/login_windows.go b/login_windows.go
index 4056d4e..70c08dc 100644
--- a/login_windows.go
+++ b/login_windows.go
@@ -1,7 +1,8 @@
 package main
 
 import (
-	"github.com/robfig/config"
+	"syscall"
+	"unsafe"
 )
 
 func checkUser() bool {
@@ -9,14 +10,19 @@ func checkUser() bool {
 }
 
 func login(username, password string) bool {
-	c, err := config.ReadDefault("rttys.ini")
+	mod := syscall.NewLazyDLL("Advapi32.dll")
+	LOGON32_LOGON_INTERACTIVE := 2
+	LOGON32_PROVIDER_DEFAULT := 0
+	var token syscall.Handle
 
-	if err != nil {
-		return true
-	}
+	proc := mod.NewProc("LogonUserW")
+	ret, _, err := proc.Call(
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(username))),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("."))),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(password))),
+		uintptr(LOGON32_LOGON_INTERACTIVE),
+		uintptr(LOGON32_PROVIDER_DEFAULT),
+		uintptr(unsafe.Pointer(&token)))
 
-	u, _ := c.String("login", "username")
-	p, _ := c.String("login", "password")
-
-	return username == u && password == p
+	return ret == 1 || err.(syscall.Errno) == 1327
 }