Lens Flare Effect - I don´t see it on my machine

Dear friends:
How can I turn on the “Lens Flare” effect in most of newest games that I play actually ?
Some examples of games that I don´t see it is Need for Speed Porsche Unleashed and Black & White.
I know that effect is supported by my hardware, but it isn´t present.

My machine is:
AMD Athon 1.2Ghz FSB 200Mhz
Motherboard Soyo K7VTA-B
256Mb RAM (PC-133) Specteck
Voodoo 4 4500 AGO Videocard
SoundBlaster Live! Value Soundcard
Windows 98se
DirectX 8.0a
(All drivers and BIOS are updated)

Thanks for any idea !