fopen problem

I have a bit of a problem when using fopen, fwrite and fclose locally I get the flowing warnings Warning: fopen(counterlog.txt) [function.fopen]: failed to open stream: Permission denied in c:\Inetpub\wwwroot\pillars\index.php on line 30 Warning: fwrite(): supplied argument is not a valid stream resource in c:\Inetpub\wwwroot\pillars\index.php on line 33 Warning: fclose(): supplied argument is not a valid stream resource in c:\Inetpub\wwwroot\pillars\index.php on line 36 Any ideas?? R.