indeed, qt static and qt dynamic were both in C:/Qt/
i removed the dynamic version. but: the dynamic-version-folder could not be deleted! some process accessed it obviously. so i just copied the files from static-folder to the dynamic one, in hope it works fine. but it doesnt.

i didnt post you those linker errors shown when i tried to compile with Q_IMPORT_PLUGIN etc. so ill do now:
link /LIBPATH:"c:\Qt\4.4.0\lib" /NOLOGO /INCREMENTAL:NO /SUBSYSTEM:WINDO
WS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' ve
rsion='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*' processorArchitec
ture='*'" /OUT:release\LTVKv2.exe @C:\DOKUME~1\LYTH\LOKALE~1\Temp\nm165.tmp
main.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""class
QObject * __cdecl qt_plugin_instance_qjpeg(void)" (?qt_plugin_instance_qjpeg@@YA
PAVQObject@@XZ)" in Funktion ""public: __thiscall StaticqjpegPluginInstance::Sta
ticqjpegPluginInstance(void)" (??0StaticqjpegPluginInstance@@QAE@XZ)".
release\LTVKv2.exe : fatal error LNK1120: 1 nicht aufgelöste externe Verweise.
NMAKE : fatal error U1077: ""C:\Programme\Microsoft Visual Studio 8\VC\BIN\link.
EXE"": Rückgabe-Code "0x460"
Stop.
NMAKE : fatal error U1077: ""C:\Programme\Microsoft Visual Studio 8\VC\BIN\nmake
.exe"": Rückgabe-Code "0x2"
Stop.


thank you!