为了让桌面背景炫一点，灵活一点，升级了home basic版到ultimate版，有几个发现
1。gnome在win7下也有主题可以用，但是很难看，和fedora18下的gnome完全不是一个味道
2。升级之后系统path中的内容被清除，直接导致一些程序无法运行：
1）cmd下的ping和ipconfig命令失效，PATH中加入;%SystemRoot%\system32修复
2）我的Qt与OpenCV失效，Qt导入图片的基本操作都not work了！
为了用Qt+OpenCV所以重装了Qt，Cmake，OpenCV 并且找了“Qt5+OpenCV2.4.3在Cmake时候说QtCore找不到的问题”的解决方法。高手请无视，小白仔细看
软件版本：
Qt：qt-windows-opensource-5.0.1-mingw47_32-x86-offline.exe（其他的opensource版本也可以）
OpenCV：2.4.3（不是for windows的安装版，因为是要自己编译OpenCV源代码供Qt使用，而Qt使用MinGW）
Cmake：2.8.11（安装时要选“添加到系统路径中”）
我的几个路径：
Qt: C:\Qt
OpenCV: C:\software\opencv
OpenCV解压路径： C:\software\opencv\buildForMinGW（双击OpenCV就可以解压）
添加三个环境变量：
C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin
C:\Qt\Qt5.0.1\Tools\MinGW\bin（后面make和make install时用到mingw32.exe）
C:\software\opencv\buildForMinGW\install\bin （不加此路径则程序运行时报错说libopencv_core.dll找不到等）
以上做好之后，不必重启电脑，直接运行Cmake-gui.exe即可
Cmake中选择源路径与目标路径，我的是C:/software/opencv和C:/software/opencv/buildForMinGW
然后，选择MinGW模式，specify native compilers（第二个选项），然后对于C和C++分别设定，我的是C:\Qt\Qt5.0.1\Tools\MinGW\bin\gcc.exe和C:\Qt\Qt5.0.1\Tools\MinGW\bin\g++.exe 确定后点左下方“configure”，会有很多项是红色的，这正常。
把WITH_QT勾选上，再configure一次，会报错说QtCore找不到的问题，例如：
CMake Warning at C:/software/CMake 2.8/share/cmake-2.8/Modules/FindQt4.cmake:615 (message): C:/software/qt/5.0.1/mingw47_32/bin/qmake.exe reported QT_INSTALL_LIBS as "C:/software/qt/5.0.1/mingw47_32/lib" but QtCore could not be found there. Qt is NOT installed correctly for the target build environment. Call Stack (most recent call first):
cmake/OpenCVFindLibsGUI.cmake:8 (find_package) CMakeLists.txt:377 (include)
此时勾选“Group”和“Advance”（在两个路径下面）,展开Qt一项，找到 QT_QTCORE_LIBRARY_DEBUG进行设定，我的设定为C:/Qt/Qt5.0.1/5.0.1/mingw47_32/bin/Qt5Cored.dll然后configure，这次都是黑色的字了，说明没问题了，然后generate，完毕后关闭cmake
（我在这里找到的解答http://stackoverflow.com/questions/14919186/qt-creator-5-0-1-with-opencv-2-3-4-on-windows）
到这里还没结束，还需要在cmd中进入编译好的目录下make和make install，我的：
cd C:\software\opencv\buildForMinGW
mingw32-make
mingw32-make install
新建工程的时候在pro文件中添加
INCLUDEPATH+=C:/software/opencv/buildForMinGW/install/include\
C:/software/opencv/buildForMinGW/install/include/opencv\
C:/software/opencv/buildForMinGW/install/include/opencv2\
LIBS+=C:/software/opencv/buildForMinGW/install/lib/libopencv_calib3d243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_contrib243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_core243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_features2d243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_flann243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_gpu243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_highgui243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_imgproc243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_legacy243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_ml243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_nonfree243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_objdetect243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_photo243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_stitching243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_ts243.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_video243.dll.a\
C:/software/opencv/buildForMinGW/install/lib/libopencv_videostab243.dll.a
