Spyzapper is part of the aol spyware protection, seems like its set to auto update these kind of programmes nowadays tend to update every day, seems like yours is set to auto update during the evening.
Here you this might help
If you don't want SpyZapper to check for spyware and other programs that can interfere with your online experience, you can easily turn it off. 1. Go to AOL® Keyword: SpyZapper.
2. On the SpyZapper - Settings screen, click Do not block any programs; do not check my computer.
3. Click Save. SpyZapper will stop checking your computer for the specific spyware and other programs that can interfere with your online experience.
Turning off SpyZapper does not turn off AOL Spyware Protection from conducting regular scans.