I can't clean up the system every time i try, I get this error message: The thread up its stack. Using Windows seven family premium 32g. I uninstalled the program and installed it again but I get the same problem. Could someone help me? I would appreciate it. Thank you.
This been reported with this latest version and some users as an issue with the recycle bin cleanup. however I think all of them have a fat32 drive (which you do not as you have windows 7). Can you try to uncheck recycle bin and see if it still crashes.
Please, upgrade to CCleaner v3.11.1550
http://forum.piriform.com/index.php?showtopic=34004&view=findpost&p=202734
Thanks!