T&L is hardware on the video card. Specifically, it means that your video card must be modern enough to have built-in T&L support for games. I believe by around 2003 - 2004 all video cards had T&L support. But that probably excludes integrated graphics like the Intel GMA.
The simple answer is you need to install a newer graphic card. If you have a laptop, then you need to buy a new laptop because the vast majority of laptops do not allow you to upgrade the graphic card (if there is one) or the integrated graphic core.