Postage Stamps

i had just recently put in a new hard drive and programed it with windows 98 then upgrated to windows xp. i’m also having problems starting my computer, i have to have the xp disk in to start and run my computer. i try to post a picture that i have and i’ve been told that they are the size of a postage stamp and are unable to enlarge it cuz the pixels get worse. i am unable to upload any pictures, they say the size of the picture is too small. i’m at a lose here. please help me in any way.

Edra