Most new laptops or desktops sold these days come with preinstalled Windows Vista. Vista is not one of the most user friendly operating systems but if we’re looking at downgrading from Vista to Windows XP that’s not as easy as it should be either.
While you are trying to delete .exe files from the desktop you get a message saying: Cannot delete file: cannot read from the source file or disk (Windows XP) or File in use: The action can’t be completed because the file is open in another program (Windows Vista).
You get a message saying Task Manager has been disabled by your administrator, which means your PC got infected with a virus, and you can no longer access to your task manager.
Have you installed 4GB amount of memory (RAM), but Windows is reporting only 3.3GB or some random number which is not correct? Problem is if you have 32 bit processor and 32 bit OS, it can address 2^32 addresses which is no more than 4GB of RAM.
Follow this tip to fix an issue with Vista saying “BOOTMGR is missing” while trying to boot your computer.