You could try to recover them from Quarantine. Rightclick Spybot Start Center, select Run as Administrator, then click Quarantine. I'm not exactly sure what those would be listed under, perhaps it is there under the title of Excel, Word or even Office. If you find it, checkmark each one, then click Restore Selected.
If you can't find the items, then if nothing too major was found during your scans, either now or in the past, then you could checkmark everything and restore it, if you wish.
To prevent your recent documents list from being cleared again, you could stop scanning for Usage Tracks if you like:
https://www.safer-networking.org/faq/usage-tracks/
If you'd like to stop scanning for Usage tracks, checkmark Advanced User Mode, click Settings, select the Categories tab, then rightclick somewhere in the window that the Categories are in and select Spyware Scan Only, then click Apply and OK.
If you prefer to keep scanning for Usage Tracks, then you could just uncheck the result that is the Recent Document item when Spybot is done it's scan, though I'm unsure what it is called. Perhaps it is listed as Word or Excel, then Recent document list is shown underneath of it, I'm not sure.
