When i set a bp on User32.GetWindowTextA in WinXP Olly breaks just when i click the program I'm debuging. If i trace out from user32 i get into "CPU - main thread, module ctagent".
This does not happen on my other computer wich has win2k. The ctagent is not a file that my program is using.

Any sugestions why this is happening?

I just found the solution for my problem. I have no idea why, but i have a process called "CTHELPER.EXE" that uses a dll "ctagent.dll" running on my computer. This program is doing a GetWindowTextA every time i higlight a program.

So the solutin was to kill the process, now it works fine.

CTHELPER is a background task that is a plug-in manager for Creative drivers. It first appeared with Creative’s SoundBlaster Live and Audigy soundcards. The theory is that 3rd party manufacturers can use the CTHELPER plug-in interface to produce drivers, add-on features, and fixes that will integrate with a tighter fit with Creative’s sound drivers and utilities.

CTHELPER is far more trouble than it is a help (it's responsible for stuttering sound, lockups, and 100% cpu usage). Disable it.

Hehe, i deleted CTHELPER.exe, and there is no more errors.
Thanks for the info