System Is Haunted: Terminate The Program

This is not a joke! I started to hear sporadically some music and voice on my PC, like if I was listening to a radio station; I have no such application on my system. When this is happening, only ordinary applications (like Outlook or Word) are running. Stopping all the applications does not make any difference. When it happens, I have noticed that a process called 17134.exe is running and is consuming quite a lot of memory space. At start-up of my system, the original memory space used by that process is around 2000K but when I start hearing the sounds, the amount of memory used is around 58000K and varying; it uses between 10 to 30% of CPU. If I stop the process, the situation goes back to normal, no more sounds. The description of the process is ???Unload PerfMon Counters???. I looked for a file named 17134.exe on my disk but there is no such file. When I start my system, I have a window with an error message: 17134.exe application error, click OK to terminate the program. The process is recreated automatically. I make sure that my anti-virus is always up-to-date and I ran a full scan on my system. Nothing unusual was detected. I would like to know if that process is legitimate, and why it behaves like that.