Apparently, some program (a toolbar?) writes that file. Things to do:
1. Reboot and immediately delete that file using your favorite file manager (like Windows Explorer). If it doesn't work, reboot in Safe Mode and try again. If it still doesn't work, do it after you did step 2.
2. Uninstall or disable that toolbar. It's not something that comes with Windows, so you must have installed it yourself. So you can uninstall it yourself also, most likely. http://forums.avg.com/ww-en/avg-forums?sec=thread&act=show&id=185248 makes me think it's related to AVG. Disabling that toolbar might help. If not, switch to another antivirus, like Avast (free) or Kaspersky (paid). You might like to post in our AVG forum also.
The memory on the c drive has started filling up very quickly over the last few days.
I have tried clean up and nothing significant is showing. I have tried defragmeting and it is needed but when I defragment the amount of memory used increases so things get worse!
The message after defragmenting is Files that cannot be defragmented Fragments 211620 File size 11.61GB \Documents and Settings\kevin\Local Settings\Temp\toolbar_log.txt
I think I need to remove these and stop it from happening again but don't know how.