From what you indicated, it sounds like you backed up you data files but you can't access them because the applications programs that created these files are no longer on the Hard Drive.
You will have to re-install all your applications programs like Microsoft Office, Quicken, Turbo-tax etc. in order to open these files. You will also have to go to http://www.microsoft.com/updates and download all Xp security updates (and perhaps service pack 3 also if it was not restored). You will also need a free anti virus program (Microsoft security essentials is a good one) www.microsoft.com/security_essentials/ and an anti-malware program. http://www.malwarebytes.org/
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