BleepingComputer.com: Video problem?

Hello
I am running Win Vista premium and occasionally when the "Photo" screen saver kicks in the photos are in black and white. Other times they are in color. Is this normal or is there a problem. Only other problem is when my daughter has AOL on for a period of time the computer tends to slow down. Also need to keep reseting the router once or twice a day because it loses the connection.
Computer is under warranty so If it needs to be corrected I would like to know. Just over a year old

Gateway FX530
2.40 gigahertz Intel Core 2 Duo
64 kilobyte primary memory cache
4096 kilobyte secondary memory cache

NVIDIA GeForce 7600 GT [Display adapter]
Gateway FPD2485W [Monitor] (24.2"vis)

Thanks

I found the answer but thank you anyway

"Unlike the My Pictures Slideshow screensaver in XP (not sure of the exact
name), the Photos screensaver in Vista has the option of displaying in
several Themes. By default the setting is Random - so it will randomly pick
one of the themes for you. The Black and White and Sepia themes seem to come
up a lot, or maybe its because we notice them more due to their lack of
color. Maybe like I did, you thought the word "random" meant that your pics
will come up in random order, but it means that the 'theme' will change
randomly."