When you view the log file of NOD32, a blue color/font means the file is a protected system file or in use by the system because it's a system file. It is normal log by NOD32 or other antivirus that will try to scan protected system files.
If the log shows error opening file that is not a system file, please post in your reply.. the exact path and filename.
I just installed nod 32 anti-virus, and on the logs it says "error opening" after most of the files it scanned. Attached is a scan log. (fyi I always run as administrator)
I am running windows 7 professional 64 bit.