I responded to you in a hurry without trying to dig deeper into your predicament.

[i]I connected to my server via windows remote desktop and I cannot view cpu usage in the task manager.[/i]

What happens when you physically log into the machine and look at the task manager? In other words, if you physically logged in and viewed Task Manager do you see CPU activity? If you logged in via remote desktop and then physically went to the server, logged in and viewed Task Manager... the RD session would show no CPU activity in task manager but the physical session would?

[i]I know I'm runnning softwares that use at least 50% of entire CPU [/i]

Okay, so are you completely absolutely sure that this program is really using the CPU when you're monitoring it?

Does ANYthing show CPU usage in task manager? Launch Internet Explorer and see if IE moves around the CPU usage rankings. In fact, launch a few programs to make sure.

[i]it draws graphs in three different colors; red, green, and blue[/i]

The red line is your processor. So if that's moving up and down... something is using the CPU. Is the line generally pegged at 50%?

You can use perfmon to monitor core usage as well as which processes use the CPU. You can read more about it form the following links:

http://www.windowsnetworking.com/articles_tutorials/Windows_2003_Performance_Monitor.html
http://www.windowsnetworking.com/articles_tutorials/Key-Performance-Monitor-Counters.html
http://softwarecommunity.intel.com/articles/eng/3449.htm

It's pretty simple. If you need more info, just let me know.