Computer crashes when screen saver starts

Hello. This issue just started when I installed Snow leopard.
I have my screen saver set to start at 15 mins and to use my photos in iphoto as the images. (same as it was on all previous versions of OS X)
Now, after 15 mins, when the screen saver is to begin, i see a black screen, and sometime I can't recover without restarting. I've not changed any settings, simply installed Snow leopard.
any help would be great
thanks!

Niko:
Try locating and deleting these two preference/plist files:
~(yourUserName)/Library/Preferences/com.apple.desktop.plist
~(yourUserName)/Library/Preferences/com.apple.preference.desktopscreeneffect.pli st
As well, did you update via Software Update or did you download the combo? If you used Software Update, get the Combo updater instead and re-apply:
http://support.apple.com/kb/DL959
Also please, update your profile to reflect whatever computer you're using SL with, thanks.
Ken

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