McAfee Ad. blocking all web-sites including O.E./XP

Hi:
XP
Since Friday nite, McAfee Ad. keeps blocking all of web-sites along with Outlook Express, both of which I badly need to access. I no longer using McAfee, but I forgot to uninstall it that I truly regret.

I clicked 'Add and Remove' in my attempt to remove McAfee Ad., however McAfee Ad. immediately popping up to block NOT to remove it. Not only 'Add and Removal' but also all McAfee removal tools, such as 'McAfee Uninstall' and others have been all blocked by McAfee Ad., thus there is no way to remove McAfee Ad. which tormenting me for the past days.

At the bottom of the screen, McAfee Ad. is, .... 'buy full Edition' and it stays until I shut-down the PC/XP. I totally stuck with this VERY nasty ad.!

Although McAfee Ad. blocking all of web-sites and O.E./e-mails, strangely I can easily access 'my picture,' 'my document' and etc., all of which does not need 'Internet Explorer.'

btw) No 'parental monitor' set-up since there is no young kid at home.

What do I need to resolve it? :confused::confused::confused:

Any helps would be GREATLY appreciated.
Thanks,