This instructable will make you have a desktop cube, it is something like Linux's multi-desktop program.
Your specs should look a little something like this. Yes they are a little demanding, but you could live with 1 Ghz processor.
System requirements :
- Microsoft Windows XP" or Windows Vista"
- 1.4 Ghz processor
- 512 MB of RAM (1 GB recommended)
- DirectX 9.0c
- 3D accelerated video adapter with at least 64MB of video memory