I've tried to load IE8 twice now
Do you mean 'download', 'install' or do you have it installed and it will not open?
If it will not download, open you present IE browser -> Tools -> Windows Updates.
Select 'Custom' when the download window opens.
After it scans your computer look at all the updates to see what they are for, click the + sign to read what they do, and any that are about IE tick the box to download and install them. Once installed, reboot the PC even if they do not ask for it.
Will give that a try & report back.Then try a new download from:
http://www.microsoft.com/windows/internet-explorer/default.aspx
Save it to your desktop, and then install it from there.
Dave
I've actually had Firefox loaded for some time; I use it occasionally but not as my main browser.