Machine has worked just fine for 18 months. Now App store won't open for me - shows usual basket on green background with dots chasing each other to eternity, Other two users have no problems at all (I am administrator). It seems you can't uninstall/reinstall the store. Windows 8.1 on a Samsung all-in-one desktop.
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1, 64 bit
Processor: Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz, Intel64 Family 6 Model 58 Stepping 9
Processor Count: 4
RAM: 3983 Mb
Graphics Card: Intel(R) HD Graphics, -2040 Mb
Hard Drives: C: Total - 927684 MB, Free - 857450 MB;
Motherboard: SAMSUNG ELECTRONICS CO., LTD., DP700A3D-A05UK
Antivirus: Windows Defender, Disabled
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1, 64 bit
Processor: Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz, Intel64 Family 6 Model 58 Stepping 9
Processor Count: 4
RAM: 3983 Mb
Graphics Card: Intel(R) HD Graphics, -2040 Mb
Hard Drives: C: Total - 927684 MB, Free - 857450 MB;
Motherboard: SAMSUNG ELECTRONICS CO., LTD., DP700A3D-A05UK
Antivirus: Windows Defender, Disabled