"invalid signature" while updating to 7.6

I have tried SEVERAL times to update to iTunes 7.6 on my PC, each time I get a little further in the process, but I still get a window that says iTunes has an invalid signature and will not install. I have updated my ASU and deleted my temp files. What else can I possibly do? I have purchases that will not download because I cannot update to 7.6! Any help would be greatly appreciated!

Follow this process, it helped me get most of the way there:
1. Open control panel
2. double click security center
3. click internet options link at the bottom
4. click advanced tab
5. scroll down until you see the Security sub-heading
6. make sure the "Allow software to run or install even if the signature is not valid" check box is checked. (third check box under the heading)
7. click apply
8. click ok
9. download itunes and install

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