Help! Horrible Experience With Permissions

I seem to suddenly have lost capability to do various things with my PC (I am admin, Vista still correctly displays that I am admin). For instance I can no longer send/receive emails from my Outlook 2003. It says "you don't have appropriate ermissions to perform this operation".

From time to time it complains that extend.dat has disappeared whereas this is not true, it is still to be found under "C:Users<username>AppDataLocalMicrosoftOutlook".

I have ensured ownership and full control under my username of C:Users<username>AppDataLocalMicrosoftOutlook as well as C:UsersGregoireApplication DataMicrosoftOutlook.

I have also copied my Outlook.pst file to OutlookWhiteKnight.pst and redirected my inbox and mail delivery to this but TO NO AVAIL.

Of course if I turn User Access Control off it works fine again but that's a bit overstretched and surely there is a way to go back to the previous state without killing UAC.

Other things that have happened is I lost my ability to scan, ability to copy certain files from my wife's account to our archive and other sweets like this.

Ah and one last element of detail is that my wife does not have the problem and she is a standard user.

What I *suspect* the initial cause might be is that I have installed a security sweeper from my remote-access website from my employer and it probably messed up with the dtcom config but that's where my knowledge stops. I checked the config the INTERACTIVE user was there (don't ask me what that is, I found that following some threads on google and various websites). I have of course a proper helpdesk from work but they claim it's not their fault and that it can't possibly be because I am the first to report such a problem amongst many users and that as per policy they won't help me with my personal laptop etc etc. Anyway that suspicion itself as to the cause won't help me much.