1 - Is the drive you're tying to move it to NTFS or FAT32? FAT32 has a 4gb filesize limit, IIRC. In Explorer right-click on the drive letter and click Properties. If it's FAT32 and you definitely wwant this file on there, you'll need to reformat that drive.
2 - Try going down the DOS / Command Prompt route. This is a handy page for DOS commands:
http://www.microsoft.com/resources/d....mspx?mfr=true