“Server Not Found” error when accessing

I have a computer that is currently running on Windows 7 Home edition. I have created four user accounts for myself and four other close relatives. Everything else has been running smoothly until recently when I updated a program by the name Download Accelerator Plus. Since then, the two other users who could access the server before have had problems accessing my server. Each time I try to I get the message “Server Not Found”. The other two users also get the same message whenever they try to. I have a strong feeling that something in the DAP is responsible for this situation. Uninstalling and deleting the application together with its updates does not have any effect. I don’t think that there is anything wrong with my computer as all the drivers are up to date and no one has tampered with the settings they are still the same ones recommended by the computer support and the my Internet service provider which is Wild blue satellite. I have done all that I could which includes calling both the ISP and computer support staff and implemented all their suggestions without success. A reverse check on my modem carried out by my ISP did not resolve my situation as they found the modem to be functional from their end. I have run out of options so I am seeking your help in this matter.
