I had the same problem and as soon as I turned off McAfee's spyware and
personal info filters I was able to reset the cache size.
I agree 50 is a bit light.. I prefer 80megs..

cheers

"PaulBart" wrote:

> I appreciate the prompt response. First, 50 is not necessarily a better
> number. It depends on a variety of factors, including the connection speed,
> the CPU speed, the hard drive speed, the condition of the drive, the browsing
> habits of the individual, and so on. On a fast computer and a slow
> connection, you very definitely would not want to use 50.
>
> I do have ZoneAlarm, but it's the latest version, and I rather doubt it's
> the culprit, since I've turned off everything but the firewall and since I
> can change other IE settings, including, e.g., the default home page, the
> location of the temporary folder, and so on. If ZoneAlarm were blocking, it
> should be blocking the default home page change, since that 's a common
> spyware hijack.
>
> I've tried this with my admin account on this machine, with ZoneAlarm
> running, and have no problem, so I suspect it's a permissions issue of some
> kind. Unfortunately, when I run IE as administrator, I believe it's showing
> me the settings for that admin account, not for the original account, so that
> doesn't help.
>
> I guess I'll have to keep digging or just live with 50. Frustrating.
>
> "Frank Saunders MS-MVP IE,OE/WM" wrote:
>
> > "PaulBart" <PaulBart@discussions.microsoft.com> wrote in message
> > news:94FD0782-34DB-4038-8550-A78FEECD6F65@microsoft.com...
> > > I'm running IE7 on Windows Vista Home Premium, using a login account with
> > > standard privileges. I'm trying to change the "Disk space to use" setting
> > > to
> > > 128 MB, using Tools -> Internet Options -> Browsing history Settings ->
> > > Disk
> > > space to use. The value there is set to 50, so I set it 128. I'm able to
> > > set it, as far as I can tell, and when I check it again in that instance
> > > of
> > > the browser, it's still set to 128. When I open a new instance of the
> > > browser, though, it's back to 50 again. No matter what I do, I cannot get
> > > IE7 to accept a permanent change to that setting.
> > >
> > > Aside from one change, I believe this is pretty much a vanilla
> > > installation
> > > of IE7. I moved the location of the Temporary Internet Files folder to
> > > C:\Temp\Temporary Internet Files. Otherwise, I think everything's
> > > standard.
> > >
> > > Any ideas how I can get IE to stick with the disk space size I want it to
> > > use? Alternatively, anyone know which registry key controls this? I'd be
> > > happy to edit in the registry if it will solve the problem.
> >
> > 50 is a better number. Much higher starts slowing IE down. But:
> >
> > It might be a security program blocking the Registry change it needs to
> > make. A few, but not all, of the programs now doing this are:
> > Ad-aware's Ad-Watch
> > IBM Access Connections
> > McAfee VirusScan and/or Antispyware
> > Norton AV
> > Spyware Blaster
> > Spybot> Tools> IE Tweaks
> > Spybot- Teatimer
> > Spysweeper
> > Spyware Doctor
> > Windows Defender
> > Zone Alarm (free) 6.5 Reported to be fixed in later versions.
> >
> > In the case of Zone Alarm 6.5 or Norton 2007 it actually has to be
> > uninstalled. Make sure the Windows Firewall is turned on until you
> > reinstall Zone Alarm.
> >
> > Boot into Safe Mode with Networking and try the change.
> >
> > --
> > Frank Saunders MS-MVP IE,OE/WM
> > www.fjsmjs.com
> > Do not reply with email
> >