Internet Logs

I have just discovered that in my windows/internet logs file there are 880 items taking up 239mb !!!.

Most are xDB (?) & Zone Alarm files + a few other unknowns.
Could someone please advise if these are all safe to delete?

I've done a search thru Ozzu but couldn't locate any similar questions.
Also had a bit of a search thru Google but all seemed to be concerned with methods of tracking, security etc.



Thanks,
OzDave