If you're in a hurry and want a quick tool to monitor your MS server then use performance monitor for windows, set up a counter log with custom monitoring template and a custome schedule (eg: collect data for 5 min every hour). Then download Microsoft's LogParser and Codeplex's Performance Analysis of Logs (PAL) Tool (http://pal.codeplex.com/) to crunch your counter log. PAL will generate a great documented report with links to possible issue solving documents/tools.