[Mark McLeod]

If the error still occurs after turning off the protection services, then browse to the directory path given in the error (it'll be different each time but ~ C:\Users\River\AppData\Local\Temp\lvtemporaryd_494 320\) to see if it's really there and try creating or copying a file to that directory just to test your access privileges.

By the way remember to turn your firewall and anti-virus back on afterwards if this PC gets used to connect to the Internet.

P.S.
When you go looking for the missing file you may find that the directory itself is not there. Anti-virus or directory privileges may be preventing the creation of the temporary directory itself. You can also test manually ftp'ing the file from the cRIO yourself to see if you get a block message, or if the file is somehow missing on the cRIO side.