I re-installed my Dell Inspiron 1501 laptop with Windows XP, but on installation I realized that Alt + Tab doesn't work correctly. It shows me the display of the windows that I can switch between:

but it doesn't go to the window that I select.
Also if I have more than 4-5 windows open it doesn't move the selection to the last 2.
How can I solve this without re-installing the computer again? I have already installed a lot of software and ideally hope to solve this problem without another re-installation.