fwrite error (noobie I am)

I'm trying to learn PHP and I have it loaded on my PC with XP pro and IIS 5.1. I run the following script and receive the error below. //hit_counter1.php $counter_file = "./count.txt"; if(!($fp = fopen($counter_file, "r"))) die ("Cannot open $counter_file."); $counter = (int) fread($fp, 20); fclose($fp); $counter++; echo "You're visitor No. $counter."; $fp = fopen($counter_file, "w"); fwrite($fp, $counter); fclose($fp); When run I get this error: You're visitor No. 126. Warning: fopen(./count.txt) [function.fopen]: failed to create stream: Permission denied in c:\inetpub\wwwroot\hit_counter1.php on line 12 Warning: fwrite(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\hit_counter1.php on line 13 Warning: fclose(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\hit_counter1.php on line 14 I though I had set all necessary permissions but I seem to have missed something. Can someone help? I have been to numerous newsgroups and no one has been able to figure it out. I know it is something I'm doing wrong. Ron