Greetings Chris !
Thank you very much for your detailed instructions, which I carefully followed on my XP machine (although in 3) it did not seem to offer me a 'parental control' option)
Unfortunately, this didn't solve the problem and access via the 'Guest' facility had by now ceased, though access was available in 'Safe Mode'.
Since access to and from my Win98SE machine via local net also did not function from the XP, (Win 98 OK from other computers) I got the feeling that a general security problem was involved and investigation suggested a residue of Norton might be hiding.
I then searched SAF and found the Symantec site suggested to someone else by 'manshead' on 15th Julyand this solved the problem !
I then ran your suggestions through again to make sure.
All is now well , thank you.
Phil26
QUOTE(Ironbender @ Jul 8 2007, 10:46 AM)

Hi Phil,
Are you using XP or Vista ?
Go to tools -> internet options -> security tab
If you don't have "tools", RIGHT click a blank area to the right of an open tab. Left click "menu bar".
1. uncheck "enable protected mode".
2. Privacy tab - Set it to "medium".
3. Content tab - do you have parental controls or content advisor enabled? If yes, disable them.
4. Advanced tab - Check SSL & TSL, all versions should be checked. If you make any changes, save your work, close IE and reboot your computer.
5. Delete Cookies, Delete Files and Clear History in Tools, Internet Options, General tab.
6. Uncheck the box for Enable Third Party Browser Extensions in the Advanced Section (all other settings in Advanced Section are set to Default). Click Apply and close and open IE.
7. Configure Security settings for the Trusted sites zone in IE: Tools -> Internet Options, -> Security tab, select Trusted sites, Default Level. Sites, enter the address (URL) of the site in the Add this Web site to the zone: box, Add/OK/Apply.
8. Clear the Secure Sockets Layer (SSL) slate and AutoComplete history: IE, Tools, Internet Options, Content tab. Under Certificates, click Clear SSL State. Click OK when you receive the message that the SSL cache was successfully cleared. Under Personal information, click AutoComplete. Under Clear AutoComplete history, click Clear Forms. Click OK when you are prompted to confirm the operation.
9. Check the file integrity of the IE and Outlook: boot to the Windows Safe Mode by pressing F8 key several times just as Windows is about to start. Start, Run, enter sfc /scannow (It might ask for the Windows CD to upload the corrupted files). Re-registering the softpub.dll (dynamic link library). Start, Run, enter regsvr32 softpub.dll and wait for the OK message; then try again.
Chris