If you close the Explorer window showing your images and then open it again, do the thumbnails get refreshed/updated?
By the way, you're using a 46,395 byte, 433x434 pixel image to display a 65x65 pixel avatar. How about taking this resized (3,321 bytes and actually 65x65 pixels) version of your image and using it for your avatar?
![](http://i7.photobucket.com/albums/y256/farmpond/forums/speed20racer1.jpg)
Please put it on your own image hosting server. To save it to your hard drive, just right click on it and Save Picture As ....