As Microsoft (MSFT) does its best to paint a positive picture of its Windows 8 launch, the company’s PC vendor partners continue to report weak end-user demand for computers running the new platform. The latest in a long line of such reports comes from Fujitsu (FJTSY) president Masami Yamamoto, who told reporters in Tokyo on Friday that initial demand for Windows 8 is “weak.” Bloomberg reports that Fujitsu, Japan’s top computer service provider, will miss its annual shipment forecast  as a result. “We can’t be optimistic about the PC industry,” Tokyo-based analyst Yoshihisa Toyosaki told Bloomberg. “PC makers’ bet on Windows 8 has failed, as cheaper tablet computers are taking away customers.”