Made a proper class library, and added a demo project. Fixes #1.

Author: murrayju

.gitignore

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+obj/
+solution.sln.ide/
+bin/
+*.InstallLog

CreateProcessAsUser.cs

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+</configuration>

DemoService/App.config

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+using murrayju.ProcessExtensions;
+using System.ServiceProcess;
+
+namespace demo
+{
+    public partial class DemoService : ServiceBase
+    {
+        public DemoService()
+        {
+            InitializeComponent();
+        }
+
+        protected override void OnStart(string[] args)
+        {
+            ProcessExtensions.StartProcessAsCurrentUser("calc.exe");
+        }
+
+        protected override void OnStop()
+        {
+        }
+    }
+}