Installation Files left on computer

I have just upgraded from NIS 2011 to NIS 2012 and a shortcut folder labelled "Norton Installation Files" has appeared on my desktop I find it leads me to file {NIS 19113-SHPD-FSD 21017} which contains five files as in the image shown. The path to this file is My Computer -> Shared Documents -> Norton ->.  Can these be deleted?

Norton Files.JPGhared

Re my post above - the image is not legible.  Apologies.   The files are "2012 plugin.dll"  -  "downloader info" -  "NIS Downloader" -"NIS-UPGRADE- ESD-NoDefs-19-1-1-3-EN" - symcdefs.

Yes, you can delte them: they are not needed for the functionality of your Norton program. They are in case you need to reinstall your product at a future time - however, you can download the installer of the product again instead, and then you would not need them then either. They are a convenience in such cases, but if you delete them, you will not remove anything you can't easily get again when and if you need it.

Many thanks, Bombastus for your prompt reply.