Failing autoupdate

Hello all.

I have recently installed IE 8 on my Vista Home premium desktop and noticed that the autoupdate of Sophos no longer runs,

I get "could not contact server" error and the little red cross on the Sophos shield in the taskbar. I have entered the update details several times and made sure that they are correct. Previous to IE 8 I had no problems.

I have had a read of http://www.sophos.com/support/knowledgebase/article/59494.html and would like to start by trying this.

The issue I have is that Step 2 states "In the Computer Management window, open Services & Applications | Indexing Service | System | Directories"

I can't find the path above, all I see is "Services" and "WMI Control" and cannot find anything refering to directories to add exclusions.

I googled it a bit and found some references to GPEdit.MSC, which apparently my version of Vista Home doesn't have,

I would sooner have Sophos Autoupdate than the lastest version of IE, so if it is necessary to revert to an older version I am more than happy to do that.

Thanks for your time.