I have recently installed a theme and had to rename the original shell32.dll to shell32.dll.bak and i put in a new shell32.dll file from the theme into the system 32 folder then restarted then On starting up, and before the Windows logo displays it throws up an error message:= = = = = = = Title bar text: LogonUI.exe This application has failed to start because SHELL32.dll was not found.RE-installing the application may fix the problem.= = = = = Clicking on [OK] then displays the Windows logo then logon, following with a black screen I get two error messages. The first is the same as that above except that the file quoted in the title bar is Explorer.exe. And i don't have the original vista ultimate CD i have tried the system recovery and that didnt work. and i have VERY important data that i DON'T WANT TO LOOSE! what's the solution to this problem?!