Install Windows 7 on CPU = 2.80/1 GHz! RAM = 1.50 GB

That looks OK but what graphics card have you got, here are the minimum specs stated by Microsoft.

Getting ready to install the Beta

What you'll need

• A blank DVD
• A PC with a DVD burner
• A test PC for the Windows 7 Beta that meets these minimum hardware recommendations (specific to the Beta and subject to change in the final version of Windows 7). Please do not use a PC you rely on for your work or daily use:
  
  
  • 1 GHz 32-bit or 64-bit processor
  • 1 GB of system memory
  • 16 GB of available disk space
  • Support for DirectX 9 graphics with 128 MB memory (in order to enable Aero theme)
  • DVD-R/W Drive
  • Internet access (to download the Beta and get updates)

http://www.microsoft.com/windows/win...tructions.aspx

Scooter70 said:

I'm running Win7 on an old laptop with a 1.5Ghz Pentium M processor and 1.5GB RAM. It runs better with 7 than it did with XP Pro. As mentioned, you won't be able to use Aero but the operating system still works great.

My Laptop is over 2 years old & works perfectly well with W7 & Aero.

Click the 'My System Specs' at the bottom left of this post for my System details