Well, I've tried that first, but it didn't work.
I did solve the problem though, running D2010 in compatibility mode for WinXP.
The problem now (now that I got D2010 to work), is that D2010 is way too slow on Win7, so I'm back on WinXP.
I checked where the slowness comes from:
any line of code like x:=TX.create is extrememly slow.
My program is quiet large (+/- 1 million lines of code). I don't know if this is the reason, but I would appreciate if someone lets me know if you had the same problem, and how (if) you fixed it.