[Greasemonkey] Cannot use GreaseMonkey :-(

[Guess Who am I]

Hi, in the Tools menu of Firefox, options "Install user script" and "user 
script commands" are grayed (unavailable). There is no context menu entry in 
the link context menu, and when I use "Manage user scripts" in the Tools 
menu, clicking on the edit button at the bottom of the window (near 
"Enabled" checkbox), the window GreaseMonkey window closes itself, without 
doing anything else.

What may I do? I've been uninstall the extension, downloaded lattest version 
(0.3.3) and previous version (0.2.6) but results are the same.

My Firefox version : 1.0.4
Other extensions installed :
- Add N Edit Cookies 0.2.0.4
- Show Image 0.3
- LiveHTTPHeaders 0.10
- Nuke Anything 0.2
- Tabbrowser Extensions 1.14.2005042701.1
- Download Statusbar 0.9.1.1
- Sage 1.3.3
- Web Developer 0.9.3
- View formatted source 0.9.3.3
- Greasemonkey 0.3.3

All these extensions are up to date at this time, and installed (no need to 
restart Firefox)
Just another detail : according to Windows parameters the default program to 
open .js files (and .source.js) is a text editor (Ultra Edit). This thing 
has been verified (double click on a file named menu.source.js really launch 
Ultra Edit properly).

Thank you for your help. PS: I have web designer skills, not Firefox 
extensions developper skills.

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