Vista - problem after downloading 2007 off prof

sorry new to this site and tried to send previous message not sure if went or not so trying again.

I purchased recently Microsoft Off Prof 2007 version and installed. After doing this I can no longer access on-line banking and after confirmation with the bank that there is nothing wrong with their site, they have confirmed that they wont help and that I need to speak with microsoft. Been in touch with them and they wont help as they say because I am home user should not have bought Off Prof 2007 version so they wont assist. How can I get a full list of all the browser set up internet settings that the machine should be showing to get my problem resolved? I just want to get this back to the normal settings before installation and just cannot find anyone to help. My machine is Windows Home Vista 32bit Triple Core Processor manufacturer acer?

Thanks

Stegg