From what I know of the items on your list - none of them are essential. But some may be helpful to you.
But, since they're missing (and you didn't say you missed anything on your system), I'd suggest just leaving them as is.
FWIW - the one's in your System32 subdirectory aren't familiar to me, but the names suggest spyware to me. Did you remove some spyware from your system?
The SpySweeper entry appears to be truncated. This could be an accident (and restoring the extention to exe could fix it) - but it could also be the result of spyware/viruses.
So, I'd suggest that you perform a free, online scan of your system (requires IE) at: http://housecall.trendmicro.com/
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