Hey Olivier, do you read my blog ? Here is the answer to your question, but this solution is not official
Link to Innovative Technology Weblog » How to relocate your Groove 2007 files to another disk
Roy Osherove just posted a link to a really hilarous story about a fantastic hacker, a must read.
I spend a part of this evening fighting with ScriptManager.RegisterClientScriptInclude and had no chance to use it in a way that my javascripts would appear after MicrosoftAjax.js and in an order that I defined.
I finally found a solution, using ScriptManagerProxy and declaratively listing the javascripts in the order I wanted.
I was experiencing for some time a quite strange effect on my no so old installation of Windows Vista. After some dyas of usage without any reboot I sometime was unable to open any new window, it could be an explorer, internet explorer 7 tab, a menu of tray icon, and this without any error message. I first thought it was an issue with the video driver, but after too much annoyance I searched the web and found a post "Max Num. of Open Windows under XP/2003/VISTA - Resolved !' explaining the issue and a possible fix.
From Ohad's WebLog