Aero is the new feature of Vista that gives the windows in vista a looking through the glass experience. But it is not possible to run Aero in XP, since it require a good video memory card and even if you have one Aero did not support XP.
But we can use a freeware tool called “Glass 2K” which adds transparency features to XP.It is made for window 2000 but also supports XP.The advantage of using Glass 2K is that it requires only 256 MB of RAM. More over we get the nice transparent feel of Vista. After installing Glass2K you can start it from Start>Programs or simply set it to run at start up.

Glass 2K shortcuts:
1. Control + Shift + 9 : Least transparency
2. Control + Shift + 8 : A little more transparency
3. Control + Shift + 2 : Very high transparency
4. Control + Shift + 1 : Maximum transparency
5. Control + Shift + 0 : No transparency or Solid