problem with xp

This is my situation:

1)I install Qt4.4 so i can run my custom qt-based program.
2)..then i decide to install a program that also installs the Qt3.4 library.
3)Now, my custom programs don't execute and windows gives me this error message:
"Cannot find entry point(z21q REGISTER RESOURCE DATAiPKHSO_SO_) in dynamic link library in Qtcore4.dll"
4)I uninstall the program, the qt3.4 library and the qt4.4 library and then i reinstall the qt4.4 library
5)..........i have the same problem.....???????????????
6)???????????????????????????????????????????????? ?
7)what's the problem?????????????

Where is QtCore4.dll located on your system?

go away from windows!!!!!!!! this is my ADVICE.....

so, i install a "program X" containing the library QtCore4.dll so in my system there were two different type of the "same" dll, one in the X's bin directory and the other in bin's Qt directory.

I guess that the problem could be that when i launch my custom qt program, it loades the "X" QtCore4.dll library instead of Qt ones.

How i resolv the problem???? Using a Linux approach.......ihihih
I write the bin' "X" directory path after the QT directory path in my system PATH.....so

PATH=C:\program "X"\bin;C:\Qt\bin
becomes
PATH=C:\Qt\bin;C:\program "X"\bin

.....and so the problem disappear.....

On linux you can have same problems if you have differend copies of the library in location where the dinamic linker look for them.