Can't open output file

hallo,
yesterday i installed nsis the first time and now i tried an example.
i have nsis 2.35 and hm nis edit 2.0.3 under vista.
but when i do compile and start in nis edit with an example i get the message:
can't open outputfile

what can it be?

installer already opened?

which installer do you mean?
the editor is running alone.

it shows at the end of compiling:
...
Processed 1 file, writing output:
Adding plug-ins initializing function... Done!
Processing pages... Done!
Removing unused resources... Done!
Generating language tables... Done!

Output: "C:\Program Files\NSIS\Examples\BgImage\BgImageTest.exe"
Can't open output file
Error - aborting creation process

"C:\Program Files\NSIS\Examples\BgImage\BgImageTest.exe" is already running, or you don't have write access to it

i have it:

i have to use the editor as administrator! i have changed the property of the editor program and all is OK.

thanks for tipps!