Can't open uploaded file...

Hi!
I'm having a terrible experience with upload files.
I've read many articles showing how to upload files using PHP and MySQL.
So here's my problem. The file I think it's rightly uploaded, because I can get the filesize, the filename but I can't open the file. Take a look:

// If I use this, I get an error message saying that is an array
$fp = fopen($myFile,"rb");

// If I use this, I get an error saying that could not find the file
$fp = fopen($myFile_name, "rb");

I'm using Windows 2000 and I've tried to make this with Apache and IIS and with both I get the same message. So I tried to modify php.ini to another temp directory, and I still get the same errors. Then I looked and php.net website for a PHP variable for the Temp directory in the system, and even with this I get the same error.
And I've tried move_uploaded_file(), copy()... and have the same problem.
In the form, I've inserted the tag: enctype="multipart/form-data" correctly, inserted the MAX_FILE_SIZE tag too and the size of the files I want to upload are less than 200 Kb.
Can anyone help me this?!

I solved the problem.
I was using globals Off and then using the command:

import_request_variables("GP");

For automatic create the variables on the script as I read at php.net website.
But this doesn't work for uploaded files, so when I tried to open the files with fread() I always got an error, because it changed the type of the variable of a FILE to an ARRAY.
So, I first tested with globals set to On and it worked fine.
But, as I need it with globals Off, I used:

$_FILES["myFile"]["tmp_name"] to get the temporary name of the file at the server and I works 100% fine!