Ok, I've answered this question too many times. So I'll make a thread about this.
U get a box that says the file is being used or something like that when u try to move it, delete it, and rename it rite? well, here's a easy and simple answer that i found myself when i had this problem
Determine the file ur trying to delete. make sure it's not being used. (Duh)
Step 2: if it's not being used, but it says it is, then ignor the message.
Step 3: Share the folder ur file is in. Don't worry, it's only temporary. Share as in Share in Kazaa
Step 4: Go into kazaa, and in My Kazaa Lite K++, go find the file in there
Step 5: rite click the file and click delete, or click the x
Step 6: say yes, and ur done
This works for everything and every time u get a problem like this.
So people, here it is
EDIT: Oops, Step 7 is to unshare the folder that ur file was in, if u want (OPTIONAL)
EDIT: yes i know nikita parrot dude made a very very good guide for this, but i still think doing this is so much easier. no need to restart or edit registry or anything with safe mode. try it out