I think we've the same problem.
Here's an explanation.
Computer A:
username: Paul
password: luaP
Computer B:
username: John
password: nhoJ
Both computer have a software deployment tool (OCS, DesktopCentral...)
Using the network agent of these tools will grant SYSTEM credentials
so %TEMP% will NOT be:
c:\Document and Settings\John\Local Settings\Temp
but
%WINDIR%\Temp
We can create a local admin account on each computer but it's TEMP directory will not be the real user one.
So, a parameter is missing for cleaning TEMP, Browser cache... for ALL COMPUTER USERS.
++
Vincent