Alright, so after a long time of absence, I once again installed FS2 Open using the Installer program. When trying to run the game through the launcher, however, I get the message "Unable to get Proper Pixel Format for OpenGL Win32".
So I took a look at the forums, not wanting to use D3D8, and found some. However, they mostly conclude that it must be a problem with the GPU (Graphics Chip) or Windows Vista. This however can't possibly the case.
Windows XP SP2 [[So it is no Vista Problem]]
ATI Mobility Radeon 9700 on the current Omega Drivers [[Supports OpenGL in other games]]
Intel Pentium 4 HT 3,0 GHz
1256 MB RAM (Yeah, I know, strange number. Long story.)
And yes, it is a Notebook.
In any case, my main problem is this: it worked before. I admit that I updated the GPU drivers a couple of times since the last time, but the problem is definitely not related to my GPU. Also, since other games work, I can only conclude that it must be a problem within FS2. The same problem is encountered with WC: Saga, obviously, which ALSO worked before.
I hope to shed some light on the problem and possibly have motivated someone to take a qualified look at it. Any help would be appreciated!