IE7 History not cleared in Vista while UAC is on

Why isn't the IE7 history cleared when I run CCleaner v1.40 while Vista UAC is on? It only clears when UAC is off. CCleaner fails to remove the Low folder in the History folder but can be deleted manually from cmd.

Cache Folder for VISTA Protected Mode:

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5 [dir]

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5\Index.dat

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5\..random1.. [dir]

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5\..random1..\..cache files..

- - - - - - - - - - - - - -

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5\..random8.. [dir]

c:\users\login-name\appdata\local\microsoft\windows\temporary internet files\low\content.ie5\..random8..\..cache files..

Cookie Folder for VISTA Protected Mode:

c:\users\login-name\appdata\roaming\microsoft\windows\cookies\low [dir]

c:\users\login-name\appdata\roaming\microsoft\windows\cookies\low\Index.dat

c:\users\login-name\appdata\roaming\microsoft\windows\cookies\low\..cookie files..

History Folder for VISTA Protected Mode:

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5 [dir]

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5\Index.dat

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5\mshist01.. [dir]

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5\mshist01..\Index.dat

- - - - - - - -

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5\mshist0n.. [dir]

c:\users\login-name\appdata\local\microsoft\windows\history\low\history.ie5\mshist0n..\Index.dat