How to clean the PC of QT and reinstall qt7.6?

1) QT-7.6 loads on XP-prof_sp3 OS PC with DirectX-9, but on running gives error as follows:
DLL server window: QTplayer.exe - Application error:
The exception unknown software exception (0xc0000409) occurred in the application at location 0x0040130d.
2) After repeated trials in installation the QT-7.x, it is neither running nor de-installing from start-up or control panel. It rolls back de-installation after almost completing it.
3) Also tried QT removal from system as given in the qt-support site i.e delete folders and qt files from win/system32 and recycle bin after de-installing using regcleaner>qt de-install using qt uninstall start-up menu>run regclean>shutdown>restart>reinstall qt-7.6>gives installation error now....???
4) How to clean the PC of QT.
Please help
as

Please refer to the below shown link as I feel this might be helpful to you
http://www.instructables.com/id/Clean-Your-Sticky-Laptop-Keyboard/?ALLSTEPS
Hope this helps, for any further queries reply to the post and feel free to join us again
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Thank You,
K N R K
Although I am an HP employee, I am speaking for myself and not for HP

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