PART ONE: A FEW FINAL COMMENTS
Since you did a clean install of WinXP, the McAfee free-trial is no longer a concern here.
The only way you could have successfully "transferred" the Outlook Express data to Outlook 2007 (i.e., on the Desktop computer) would be via
Importing the data into Outlook. If you attempted to Exportthe data from Outlook Express to Outlook [yes, there's a difference], that may explain the orphaned
Tasks.pst.tmp file (which you can just delete to the Recycle Bin, if possible).
Moving on (which I must do also after posting this reply)...
PART TWO: SUGGESTIONS
OPTION A: Residents of North America (US & CA), the UK (and perhaps other regions now) may obtain
Microsoft-sponsored Premium (i.e., paid) Support via the Answer Desk =>
http://answerdesk.microsoftstore.com [1] [2]
OPTION B (Recommended): Chances are you're seeing the effects of a longstanding hijackware infection, most-likely "inherited" from the Desktop PC - and possibly compounded by a W32/Alureon-variant rootkit infection! See...
• Cleaning a Compromised System
http://technet.microsoft.com/en-us/library/cc700813.aspx
If you need additional assistance with the clean install of WinXP, you can begin your own, new thread in this forum:
http://answers.microsoft.com/en-us/windows/forum/windows_xp-system
If the procedure is outside of your technical "comfort zone" - and there is no shame in admitting this isn't your cup of tea - take the computer to a local, reputable and
independent (i.e., not a "BigBoxStore" or the Geek Squad!) computer repair shop & let them do the work.
Note: IMHO the computer should NOT be connected to the internet or any local networks (i.e., other computers) in its current state. All of your personal data (e.g., online banking & credit-card passwords) should be considered at-risk, if not already compromised.
Wish I'd had better news for you. Good luck!
I have nothing further to contribute to this discussion so I'm no longer monitoring your thread. Over & out...
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[1] $99.00 USD for "up to 2 hours" of remote support, paid up-front & no guarantees whatsoever!
[2] Microsoft hasn't offered WinXP users any support (Windows Update-related or otherwise) since 13 July 2010. There will be no further security updates for WinXP after 08 April 2014.