One thing I have discovered today, that when I am installing Qt on the folder C:\Qt it is working in Xp but if I am installing Qt in folder C:\Qt\2009.5 (which is the default folder of installation) it is not working.

second thing is that even in this case also release build is not working UNLESS I copy qtcore4.dll and qtGui4.dll from C:\Qt\qt\bin folder to release folder. I find that qtCore4.dll in C:\Qt\bin folder have different size than qtCore4.dll in C:\Qt\qt\bin folder. Please let me know that whether release build is working or nor in Win7 after copying these 2 dlls.

regards
rittchat