Installation was interrupted message for a routine upgrade

Question

Right after "Publishing product information":
"The iTunes for Windows installer has completed.
The installation was interrupted before iTunes could be completely installed.
The System has not been modified. To install this program at a later time, run the installation again.
Click Finish to exit the wizard. "
Describes the problem, but (1) this is a routine upgrade from the previous version (I've never had problems before), (2) I disabled all virus protection etc. (3) downloaded an other copy to make sure not corrupted
Dell   Windows XP Pro  

Answer 1

hmmmmmm.
okay, let's try enlisting some additional technical help.
let's try getting a installer log to someone who can interpret installer logs.
Start menu -> Run... In the text field of the dialog that comes up, type in "cmd" and hit return.
In the command prompt dialog that comes up, find the iTunes installer on your desktop and drag it to this window. Then on the same line type in a space and then the following:
/Verbose"c:\log.txt" /V"ENABLE_QTLOGGING=TRUE"
There is no space between the e in Verbose and the double quote ("). There is no space between the V"Enable...
Hit return.
The installer will create two log files:
C:\log.txt and C:\qt.log
Find those files and send them to this email address Put the URL to this discussion thread into the email, so that the person who gets it has some context. Let them know the version of itunes you’re trying to install, too … in general, give as much info as you can.