I have had similar problems connecting my new computer with Windows 8.1 to my wireless system. All my other equipment, older computers, smart phones, Kindles, etc worked great, but the new computer. After 3 weeks of frustration, talking with the support from Dell, with no success, Returning the Dell computer and buying a different brand with Win 8.1 only to have the same connectivity problems, a sales employee at Best Buy told me to change my wireless modem. Seems that if your modem is over 3-4 years old, 8.1 will not connect. $45 later and a new modem, BINGO, everything works.
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