Thanks for the reply Ashaman.
I may be doing it in a week or so... as I have exams this week. I just can't believe that my FS9 folder is 24gb (after a "cleanup")

What is the exact job that must be done in the registry? is there any site where it's explained?
Thanks ;)
How I did it:
I
copied the whole FS9 folder to the new destination. [glow=yellow,2,300]NOT MOVED, copied.[/glow]
Entered the regedit and began doggedly searching (with the search function) all and every call to the old FS9 path and redirecting it to the new copied one (only this part took away about 4 hours of attentive handy work).
Once finished, ran a last control all over the registry to see if I had forgot something.
Having found no discrepancy, went in the new FS9 folder (still having the old folder
not yet deleted) and tried starting FS9 from there.
As FS9 worked correctly from the new position (all the add-ons worked correctly too) I deleted the old FS9 folder.
That's all folks.
[glow=yellow,2,300]Warning and Disclaimer:[/glow]
Be VERY wary when editing the registry. One of the things I decided to do when into the registry (to avoid creating problems to my system) was to be completely attentive of what I did and aware of what I changed. This means that when I felt tired (and it happened often, as the maniacal attention needed saps away energy like you won't believe), instead of going onward risking to mistake something, I stopped doing what I was doing and went in the kitchen for a coffee or something, then, once I felt ready again, restarted editing the registry. This was the main reason that four hours of continuous work became a whole afternoon and good part of a evening (then again, I have a lot of complex add-ons installed).
BTW, my PC was and is still secured by an UPS (all my PC's are), so power outage or irregularity would not put me in troubles.
If you decide to follow my example remember that I do not take any responsibility of any error, problem or other disaster may occur on your computer. What I described is a very delicate matter over which I would take responsibility only if it was I who did it. As this is substantially impossible in this case, (let me repeat myself please) I won't take responsibility of any problems may occur.
Sorry for the blunt, hard nosed approach, but in these matters, better be clear from before the start.

There's but one real cure for human stupidity. It's called DEATH.
At the moment mourning the assassination of sarcasm and irony for the good of the "higher".
Proud FSIX user. Active user of FS98, X-plane and novic