diff --git a/go.mod b/go.mod
index f76bfd5..79a35bc 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.19
 
 require (
 	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/postfinance/single v0.0.2 // indirect
 	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
 	github.com/tklauser/go-sysconf v0.3.11 // indirect
 	github.com/tklauser/numcpus v0.6.0 // indirect
diff --git a/go.sum b/go.sum
index df93957..4664a37 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,13 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/postfinance/single v0.0.2 h1:YLjLxxeGDnsW93oK4CxxOFSVOOiBi1OyoK4ZTl5biJw=
+github.com/postfinance/single v0.0.2/go.mod h1:OYWUsdMIZK9eQyZYpAsMHN+j6+jXJ6RFUNqIWH0oC5U=
 github.com/shirou/gopsutil v3.21.11+incompatible h1:+1+c1VGhc88SSonWP6foOcLhvnKlUeu/erjjvaPEYiI=
 github.com/shirou/gopsutil v3.21.11+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tklauser/go-sysconf v0.3.11 h1:89WgdJhk5SNwJfu+GKyYveZ4IaJ7xAkecBo+KdJV0CM=
 github.com/tklauser/go-sysconf v0.3.11/go.mod h1:GqXfhXY3kiPa0nAXPDIQIWzJbMCB7AmcWpGR8lSZfqI=
 github.com/tklauser/numcpus v0.6.0 h1:kebhY2Qt+3U6RNK7UqpYNA+tJ23IBEGKkB7JQBfDYms=
@@ -12,3 +18,5 @@ golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
 golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main_windows.go b/main_windows.go
index 859b73d..787661f 100644
--- a/main_windows.go
+++ b/main_windows.go
@@ -12,15 +12,37 @@ BOOL SetPriority(DWORD pid, int priority) {
 */
 import "C"
 import (
+	"github.com/postfinance/single"
 	"github.com/shirou/gopsutil/process"
 	"os"
 	"runtime"
+	"syscall"
 	"time"
+	"unsafe"
 )
 
+func MessageBox(lpText string, lpCaption string, uType int) int {
+	var convertedCaption, _ = syscall.UTF16PtrFromString(lpCaption)
+	var convertedTitle, _ = syscall.UTF16PtrFromString(lpText)
+	returnCode, _, _ := syscall.NewLazyDLL("user32.dll").NewProc("MessageBoxW").Call(
+		uintptr(0),
+		uintptr(unsafe.Pointer(convertedCaption)),
+		uintptr(unsafe.Pointer(convertedTitle)),
+		uintptr(uType),
+	)
+	return int(returnCode)
+}
+
+var lockFile, _ = single.New("autoPriority")
+
 func main() {
+	if err := lockFile.Lock(); err != nil {
+		MessageBox("The program is already running", "Only one instance of the program can be run\nYou can close it via the Task Manager", 48)
+		os.Exit(1)
+	}
+
 	C.SetPriority(C.DWORD(os.Getpid()), 0x00000040)
-	for {
+	for range time.Tick(time.Minute) {
 		processes, _ := process.Processes()
 		for _, proc := range processes {
 			memoryInfo, err := proc.MemoryInfo()
@@ -29,6 +51,5 @@ func main() {
 			}
 		}
 		runtime.GC()
-		time.Sleep(time.Minute)
 	}
 }