IF you can find the registry entry for the internet temp folder size you can write a script to set the value when people login. I believe you will find the setting under the HKCU key and maybe a default setting under HKLM and/or HKEY_USERS/default. Then you can write a small script and schedule it to start at login using the group policy MMC snapin. Make sure you point the snapin at the local machine. Or, if they are on a domain, put it in their login script. Let me know if you need more detailed information.