No focus

It does not get focused on object. Looks like there is something on lenses inside the camera because when I do wide zoom directed on white paper there are few gray dots visible on the picture. I tried to open it but did not get to the lenses. Is it posible to open it with some instruction from you. Minolta does not support digital cameras anymore and there is not local repair stores. I like it but can not use.
Thank you in advance