Hi, so I have a problem with the Aero theme on Windows 7, a weird one!

The thing is that the theme is not working, it worked perfectly when I installed Windows 7. But out of the blue, it didn't worked anymore.

Desktop Windows Manager IS enabled (I triple checked it!) and running!
If I open Aero Troubleshooting, it will take forever (at least 30 min) until it detects the problem, so most of the time I cancel the process.

CPU Details:
1.5 GB RAM
512 MB Video Card
1.81 GHz Processor
32-bit version
Windows 7 Ultimate

Thanks...