Invalid Not sure if this is a bug or not...

I can only play SRB2 with 600x400 resolution and whenever i use the launcher to try to get it to 1280x1024, the size of my monitor, it says "VID ERROR: MODE NOT AVAILABLE". Please tell me if its my computer or the game.

Thats the game because its not supported, I think

No, it means that your computer has a horrid graphics card. SRB2 automatically checks your video drivers to determine the screen resolutions which work on your machine, and lets you select any one of them. Evidently your computer doesn't support 1280x1024 resolution.

My graphics card is very bad. It cannot support 1368(?)x768. I cannot use anything higher than 600x800(I think) without being slow on almost every level, yet my monitor is 1368(?)x768. My graphics card is so bad, I cannot complete the room in CEZ2 where all of the swinging maces are. It is so slow. I can barely manage DSZ1's first room.
Is my post relevant?

Upgrade your graphics card.