Dell Latitude D630 with Kingston 120GB SSD (trouble?)

Hi!

I have installed a Kingston 120GB SSD into my Dell Latitude D630, and the

Notebook doesn't became faster. Now I have HD Sentinel installed, and there is

shown: Performance: 80%  Health: 100%. It was a brand new SSD. And there is a text:

The status of the solid state disk is PERFECT. Problematic or weak sectors were not found. 
The TRIM feature of the SSD is supported but disabled. It is recommended to upgrade the operating system, the disk controller or its driver to improve performance.
The health is determined by SSD specific S.M.A.R.T. attribute(s): #231 SSD Life Left

I have Windows 7 Pro with all Updates 32 bits. I don't know, what to do, can You help me?

Ah, I have the Controller in AHCI mode! (Factory default is ATA)

I have Drivers from: [View:dellwindowsreinstallationguide.com/.../:550:0]  downloaded, but there was no AHCI/SATA driver, so I installed an older one.

Thanks a lot for Your Help!!

With best Regards

Zoli