Planecrazy .....
Have you installed the same software on your IBM that you have on your acer, hp and dell ?
Have you got the same amount of data on your IBM that you have on your acer, hp and dell ?
Have you been using your IBM as long as you have been using your acer, hp and dell ?
For the above, and numerous other reasons, there are no grounds to your statement :
IBM do something special to Windows
Unless properly managed, Windows can, will and does get clogged up after an extended period of use. At 3 months old, your IBM is still a baby ... well just