Why So Many Temp Files On Hard Drives

I am using Windows 7, My desk top computers has three hard drives, the "C" with just the programmers and other system files, the other two hard drives (all SATA) are used with my main files (E & F) . Drives E & F are set as "Shared drives " I often update files between my Toshiba laptop (also using Windows7) and vice versa. I have a hard wired network connection between these two computers. Now my question why are so many temp files being added to my shared hard drives, I have only noticed this recently, I certainly did not get these when I had an XP Pro set-up, and between four computers. Is this problem associated with me allowing shared use between computers? I am also running office 2010 on both these computers. My emails are using outlook and IMAP, both computers emails systems are always synchronized, I think this is a feature of MS Office 2010, and is very helpful.

What happens if I delete these temp files? I am enclosing a copy of the temp files on my "e" drive so you can see.