Possible you downloaded fake/malware app.
Qt Bitcoin Trader for Windows have digital signature.
Please always when you download any exe file for Windows Google it first, find official site, double check source, digital signature and information about this file on http://virustotal.com
Highly recommend to use secure auto update.Known fake domains and malware trader apps discussed here:
https://bitcointalk.org/index.php?topic=400487 Qt Bitcoin Trader does not have withdrawal functionality and API rights allowed only for Trade/Info.
Please report your download link here:
https://bitcointalk.org/index.php?topic=400487