Compiling error

Hi, I got strage errors from arduino. When I try upload some sketches (ISP, Labview interface, some of my programs) to arduino it show big error message:

but if I download fresh arduino software it works, but only ONCE...

quincy:
When I try upload some sketches (ISP, Labview interface, some of my programs) to arduino it show big error message:

Is the error message the same regardless of which sketch you are trying to upload?

Is the first error message always this…

optiLoader.pde:85:24:error: optiLoader.h: No such file or directory

no error is different, depend on program, for labview:

but with fresh arduino software i upload ok, but only once

quincy: no error is different, depend on program, for labview

Pick one sketch to get working.