Renewal Download did not complete, now will not start over.

I attempted to renew my trial version of Norton Internet Security 2011 on my new laptop.  After downloading the NISDOWNLOADER.EXE file I clicked on and ran it.  Unfortunately I lost my internet connection before completing the 134MB  download.  Now when I try to run the NISdownloader.exe file to complete the download I get the following error message.
 
“NORTON DOWNLOAD MANAGER - Another Download manager is currently running.  Please wait for it to complete and try again. -  OK”
 
In my task manger window I can see the NISdownloader program is apparently running, but using no CPU percentage. 
When I try to end the process I get this error message.
 
“Unable to terminate process. - The operation could not be completed. Access is denied. – OK”
 
Iam using Windows 7 on a new Lenovo laptop.
 
How can I complete the download and installation for my new 3yr subscription to Norton Internet Security 2011.
Iam contemplating uninstalling Norton completely and trying a whole new download from scratch.  Obviously Id like to avoid this if possible.
Any and all help and advice appreciated.
Joe