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Hey, Harryner, some Arrows Tab came with Windows 8. TThey haven’t been out for very long, and I’m not even sure they have been released in all markets. Until just a few days ago, the 8.1 Preview was not available for machines with 32 bit Atom SoC processors (like the Arrows Tab QH55), but Microsoft made some new drivers available that resolved the issue. I looked into it a little, and for some reason, Fujitsu Arrows Tabs are one of the only devices that are still blacklisted for the upgrade. Microsoft is aware of it, and I’m sure Fujitsu is as well, especially since these tablets are aimed at enterprise users. I’m afraid you are going to have to wait for them to resolve the issue.