You should be able to do those commands using a batch file of some description, whether you run it yourself or via task scheduler should make no difference.
I think you need to Unlock, encrypt the file, copy it into the directory, and then lock again so:
pgpnetshare --unlock c:\encryptedfolder\ --passphrase blahblah
then
pgpnetshare --encrypt c:\unencryptedfolder\filenamehere.txt --recipient usernamehere --passphrase blahblah
That will then encrypt the file then copy file
xcopy c:\unencryptedfolder\filenamehere.txt c:\encryptedfolder\filenamehere.txt /y /x /o /h /q /v
copy file with a few switches for robustness then
pgpnetshare --lock-all
The task scheduler will not be able to store pgp passphrases, so you would need to supress the display of the task by using the ECHO OFF command, and lock the batch file right down so only authorised people can access it