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#1
I wouldn't like to do that unless I'm absolutely sure it won't break the whole system.
Although this question and answer is a bit old I think the advice given by Brink (forum admin here) is still relevant:
Is it safe to delete the $RECYCLE.BIN Folder? Pls Help? - Windows 7 Help Forums
Hope it helps.
If you need additional free space see these links:
Free Up Drive Space in Windows 10 | Tutorials
Move Users Folder Location in Windows 10 | Tutorials
I often use TreeSizeFree to delete old folders like this with no ill effect