gimp does something odd on startup

[Ofnuts]

Still, very unlikely to be Gimp's fault. Problem is more likely to be with a file (which type is is? XCF? JPG? PNG?) that Windows wants to open on startup, and the current system settings make it open with Gimp (on install, Gimp is associated to several image types). Chane the file associations for the type of the image and some other app is going to open the image on startup.

Also note the "by mistake" in my answer... Files often get dropped in very odd places.