We had one of our servers die off last week. That server had WinCustomize and our Image server on it. We moved it to a new server and in doing so the IP address changed for www.wincustomize.com and images.stardock.com.
To me it sounds like you DNS has not updated to use the new ip address. One thing to try is open a command prompt and enter the following command.
ipconfig /flushdns
This may flush the DNS of the old IP address and grab the new ip address.
To verify you are seeing the correct IP address enter the following commands from a command prompt window:
ping www.wincustomize.com
ping images.stardock.com
for WinCustomize.com it shoud resolve to the IP address of 38.99.229.8 and for images.stardock.com it should resolved to 66.28.242.210.
If you see the ip address of 66.28.242.218 then your ISP has not updated their DNS records and you may want to contact them about this problem.