Cannot access some web sites

I can no longer access certain websites that i have been able to access in
the past. Sites i cannot access are a mix of home pages and onward links
from home pages, which are themselves a mix of secure and non-secure links. I
always get the same "The page cannot be displayed" error message.
I am running XP Home Edition, with IE2 SP2 and have four user accounts set
up. Every account has exactly the same issue. I have Notron Firewall and
Antivirus software running on my PC since 'day one' and have not changed its
settings since.
I have seen other discussion threads with similar issues, and tried all the
following without success as a result:
1. Scanned my PC for viruses with latest versions of Spybot, Ad-aware, MS
Anti spyware, and Norton. No problems found.
2. checked LMHosts file (keep it set to 'read only')
3. Deleted all cookies, TIFs, history etc. for all 4 accounts
4. Downloaded latest MS Add On Manager
5. Disabled all Add Ons
6. Run ipconfig /flushdns
7. Returned to earlier system restore points

All with no success what so ever. Would appreciate an advice on what else to
try.


.

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