Attempting to install iTunes Version 10.5 and getting Invalid Signature. Can someone please help???

I am attempting to install iTunes Version 10.5. I am getting the following messages...
"Files shared by these updates" has an invalid signature. It will not be installed.
"iTunes" has an invalid signature. It will not be installed.
"Safari 5" has an invalid signature. It will not be installed.
I somehow got around this annoying "invalid signature" problem before by installing the iTunes update through the Apple site.
http://www.apple.com/itunes/download/
When I tried that, now I get...
"The installer encountered errors before iTunes could be configured. Errors occurred during installation. Your system has not been modified. Please run the installer again, or click Finish to Exit"
All this to get the latest iPhone software. And every blessed time I go to Sync my iPhone, I run into iTunes issue on my Dell PC here. I guess PC and Mac just cannot play well together.
Can someone PLEASE help me out here???
Thanks in advance for your help.
PSULionRP

Hi. I also had this problem when trying to connect a new iPhone 4S & it needed iTunes 10.5. Went to the Apple website as update section of iTunes was not getting any luck - went to downloads section of Apple website & downloaded the whole iTunes 10.5 program as though I did not have it in the first place (& also downloaded the programs for Quicktime 7.7.1 & Safari 4.0.3) ie not just the upgrades. I created a restore point in my Windows XP in case it all went pear shaped & then went ahead & installed all 3 programs. Opened iTunes at the end & all my music, apps, movies were all still there & now the new iPhone 4S works perfectly with the iTunes. Hope this helps.

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