could not find or load the Qt platform plugin

Operating System =  Microsoft Windows 7 Home Premium Edition Service Pack 1 (build 7601), 64-bit
Physical RAM     =  3957 MB
CPU name         =  Intel® Core™ i5 CPU       M 520  @ 2.40GHz
Vendor/Model     =  GenuineIntel (stepping 02)
CPU speed        =  2.393 ghz (4 logical threads)
x86PType         =  Standard OEM
x86Flags         =  bfebfbff 0298e3ff
x86EFlags        =  28100000

hi,thanks for paying attention to this thread, i try to open the emulator for the first time but an error comes up
-This application failed to start because it could not find or load the Qt platform plugin "windows" in " ".
please help i will appreciate it

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