ok! I have made it to work thanks to you all!
This is my small step by step instruction:
1. Remove all old installations of Code Blocks, MinGW, MinGW-64, and wxWidgets ... delete all folders of those applications after uninstallation process is complete.
2. Remove all references of MinGW from Path variable.
3. Download
tdm-gcc-4.5.1 from this website ->
http://tdm-gcc.tdragon.net/download4. Start installation of
tdm-gcc-4.5.1 and select to install latest stable version (from drop down menu) and make sure that "automatically add to path variable" is selected.
5. Download
wxPack_v2.8.11.03.exe from this website ->
http://sourceforge.net/projects/wxpack/files/wxpack/2.8.11.03/wxPack_v2.8.11.03.exe/download6. Install it in C:\wxWidgets2.8
7. Download Code Blocks from this website ->
http://www.codeblocks.org/downloads/268. Install it in default folder
9. Open up Code Blocks ->Settings -> Compiler and Debugger -> Toolchain Executables ... and select "Reset defaults" button.
10. Select "Autodetect" button in the same tab and it should come up with a popup to say that MinGW in MinGW32 was detected.
11. Select Settings->Global Variables select default from drop down menu click new variable and input "wx" and under base text field type: C:\wxWidgets2.8 and save.
From now on you should be able to select new project "wxWidgets" and it should compile without any problems under windows 7 ultimate 64Bit.
Uff this cost me a looooot of time and reading ... problem is that all them websites including wiki pages ... they are fairly up to date but showing super old solutions or they are working for experienced power users ... or maybe for specific combination of os, compiler, wxWidgets and IDE ...
Anyways its alll good now