I just tried CCleaner 1.25.201. Since the Version History log indicates it is compatible with Windows Vista I was hoping that it would also be compatible with X64.
CCleaner 1.25.201 does install and run, but I still find that a number of registry and desktop icon problems reported in the Issues panel are not correct.
Not wanting to take a chance, I didn't run the Fix Selected Issues and just uninstalled this version.
Still hoping a version of CCleaner that will run on X64 becomes available.
As a side issue, checking on CCleaner and X64 is very difficult, since this forum does not allow searching on three letter keywords such as "X64".