If you have McAfee VirusScan on your server, most likely the On-Access Scan feature is enabled. This is good but can cause you problems when you transfer files to the server.
For example, say you want to copy some install media to \\MyServer\C$, most likely it contains files like autorun.exe, autorun.inf, and/or autorun.ini. When you do a copy and paste of the whole install media folder, you will get the message below:
Cannot copy autorun: Access is denied.
Make sure the disk is not full or write-protected and that the file is not currently in use.
To get around this, you can right click on VirusScan icon in the system tray at the lower right hand corner and pick “Disable On-Access Scan”. This will disable that feature temporarily. Proceed with copying. When it is finished, be sure to re-enable On-Access Scan.