Pagefile.sys is a swap file and you cand delete its contents for security reasons by editing the key
HKLM\SYSTEM\CurrentControlSet\Control\SessionManager\MemoryManagement
Add the value Dword ClearPageFileAtShutdown
Give a value of 1 or 0 to keep it

Disabling / Enabling Windows XP System Restore

You can use System Restore to restore the computer to a previous state. If the computer is infected with a virus (the virus could be backed up by System Restore).
1) Log as an administrator
2) My Computer > Properties > System Restore tab
3) Check the "Turn off System Restore" > Click Apply > Click Yes > Click OK.
4) Remove virus > Restart Computer.

5) My Computer > Properties > System Restore tab
6) Uncheck the "Turn off System Restore" > Apply > OK

Microsoft Personal Security Advisor

Apply routinely all of the Critical Updates and Service Packs recommended by Microsoft at the Windows Update site: click on http://windowsupdate.microsoft.com then follow the link to PRODUCT UPDATES.
Get also Microsoft Personal Security Advisor and make the recommended changes.
You can find MPSA at: http://www.microsoft.com/technet/mpsa/start.asp.
Microsoft Personal Security Advisor (MPSA) is being replaced by the Microsoft Baseline Security Analyzer (MBSA),
MBSA can be downloaded from the following location: http://www.microsoft.com/technet/security/tools/Tools/mbsahome.asp  

A way to prevent the spam robots from getting you e-mail address from your HTML pages is to enter your mail information the following way: %20your_name@your_provider    where: your_name is your e-mail information your_provider is your e-mail provider.
It will work fine when a visitor clicks on it but the robots will get an invalid address.

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