No problem if you have different runtimes installed. xp uses the xp files and vc ace the vx ace files.I already installed it per someones else's suggestion on another forum. but throws the same error.
Could it be because I have 2 versions of this?
In Common Files > Enterbrain folder > I have two folders named RGSS and RGSS3.
I may have it when running A Zombies Life or some other.
I have some more runtimes installed for vx and even older rpg maker, all run fine here.
So you installed xp_rtp104e.exe from the website, right?