Using your PC to act as server may serve the initial purpose of file sharing, but with an actual server hardware, there are numerous advantages residing over the normal PCs.
If your system is running Microsoft Windows Vista and you are unable to access your home or office NAS (Network-Attached Storage) server, this is probably due to the fact that your NAS is running on Linux Samba File System or other OS that is using older encryption method for their server access authentication.
The fact is, probably there is nothing wrong with the system, it’s just that they might be outdated in today’s fast-moving business pace…