QUOTE (DennisD @ Oct 5 2009, 10:24 PM)

Hi Liranl, and welcome to Piriform.
You must have IE8 installed on the computers giving you the problem. Sticking on Index.dat with IE8 has been reported many times, but unless I've missed it I don't think there's a fix yet.
If I'm wrong someone will put me right, and if I'm right I'll chase this one up, and all I can suggest until you have a remedy is to uncheck Index.dat in the Internet Explorer section. Not a very good solution, but a temporary one I hope.
As soon as I have any positive information I'll post it unless one of the other members beats me to it.
Hope that helps.
I chacked in two computers running IE8 (same version) - Ccleaner works graet on one but not on the other...
anything else could be causing it ? where can I find Ccleaner log ? (I can see at the MS event log - application Hang error for the ccleaner app)