I discover the solution
When installing nvidia drives,when installing NVIDIA_GLX-1.0-3123.i586.rpm, it renames the file libGL.so.1.2 to xxx.libGL.so.1.2.RPMSAVE,so i had to rename again the file and remove what NVIDIA_GLX*.rpm put.
Like appears when running kvirc in the console it looks for the file /usr/X!!R6/lib/libGL.so.1.2
[mmodem@www mmodem]$ kvirc
Loading required GL library /usr/X11R6/lib/libGL.so.1.2
like u see now kvirc runs OK