Itunes 8 wont setup

Question

Hi guys, my Itunes loaded up fine until I downloaded the new verion 8.
It just came up with error after error installing so I uninstalled Itunes altogether and downloaded Itunes 8 again and tried to reinstall.
This is my problem.
I click on the Itunes setup file and nothong happens, no installing, no thinking Windows cursor, no nothing.
It doesnt how many times I click on setup nothing happens.
I've downloaded and deleted about 5 or 6 different Itunes setup files now thinking I may have gotten a bad one but so far the same problem.
So I go to search on my pc and delete all the Itunes and Quicktime files, go to regedit and do the same in an attempt to have a "fresh" install possibly work with no prior rubbish still in my system.
Still the same problem, the setup file does not execute.
I uninstalled my virus protection software thinking maybe something may be blocking it, nope, it still wont install.
I have 2 hdd's so I try installing to the other one.
Same problem.
So right now my iTouch is a just a paperweight as I cant install anything onto it.
Any help and suggestions would be greatly appreciated, thanks

Answer 1

*Just for Storm1968:* this relates just to "network error occured while attempting to read from the file C:\windows\installer\itunes.msi".
When you get this kind of error message, you need to use the Microsoft Installer cleanup utility to cleanup your installer files.
I will give a method for removal of iTune and related programs with cleanup and phased reinstall, but might get away with just doing the removal process of iTunes alone with installer cleanup if the uninstall gives an error.
Download a fresh copy of iTunes and the stand alone version of Quicktime (the one without iTunes)
http://www.apple.com/quicktime/download/win.html
http://www.apple.com/itunes/download/
Download and install Microsoft Installer cleanup utility, there are instructions on the page as well as the download. Note that what you download is the installer not the program – you have to run it to install the program.
To run the program – All Programs>>Windows Install Cleanup
http://support.microsoft.com/kb/290301/
Now use the following method to remove iTunes and its components:
XP
http://support.apple.com/kb/HT1925
Vista
http://support.apple.com/kb/HT1923
*If you hit a problem with one of the uninstalls don't worry*, carry on with the deleting of files and folders as directed in the method.
When you get to deleting Quicktime files in the system32 folder as advised in the method, you can delete any file or folder with Quicktime in the name.
Restart your PC.
Run the Microsoft Installer Cleanup Utility. (Start > All Programs > Windows Install Clean Up)
Remove any references you find to the programs you removed - strictly speaking you only need to worry about those programs where the uninstall failed.
If you don’t see an entry for one of the programs that did not uninstall, look out for blank entries or numeric entries that look like version numbers e.g. 7.x for Quicktime or 1.x for Bonjour.
restart your PC
Install the stand alone Quicktime and check that it works.
If it does, install iTunes.