When trying to change screen saver computer locks up

when I go to desktop/screen saver and click slide show it's goes into the loading mode with the rainbow ball turning the only way to stop it is go to the activity monitor where I find a system preferences (not responding) error and have to click it to stop process any ideas how to get my screen saver to start responding?

What Mac OS version are you running and what processor type is in your computer?
You can find both by clicking the Apple icon at the left end of the menubar and selecting "About this Mac" from the menu that appears. The info I requested will be in the About ths Mac window:
The two lines I've indicated with red arrrows will tell us a lot about your iMac.

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