Windows 7: Inspiron 1520 compatible enough with windows 7 ?

Hi all.
I have installed win 7 on my inspiron 1520 and i see 1 or 2 per day the blue screen and sometimes firefox crashes.
I have not installed any drivers or uncompatible programs.
i looked into dell website and i saw it was not listed as the compatible for 7.
What is the matter ? it s not recomended to be installed on inspiron 1520 ?
If not which of my hardware should be improved ?
thanks.

According to Dell it doesn't appear that the Inspiron 1520 is compatible with Windows 7.

Microsoft® Windows® 7 Compatible Dell Systems - KB Article - 364750 | Dell

The usual reason for incompatibility is a lack of associated drivers, not enough processing power, insufficient RAM, or insufficient hard drive space. This article gives more information.

Microsoft Windows 7 Compatible Dell Systems and System Requirements | Dell

You could try using the Microsoft upgrade advisor to see exactly where your computer might be lacking (in right column, See If Your Computr Can Run windows 7.)

Windows 7 system requirements - Microsoft Windows

1. There are more series motherboards for the Inspiron 1520, so depends how old your Inspiron is;
2. Mine is renewed, due to design cooling problems that the old series had; this was under warranty;
3. Of course, DELL does not advice the 1520, because they want sell the new laptops; but I have Windows 7 running for a couple of weeks now and only experience that my BT-mouse stops working. Seems to me a driver problem, but till now did not find a good driver and DELL does not make one for the 1520.