Have you tried to install your software in your new computer and right click on the icone and select RUN AS.. In the drop down list, Select the operating system version that was working in your old computer ;-)
Or may be it will not install at all?
You can also click on the install icon and install as older version (but this tip I am not sure I would need to test this option)
Do not trow away your old computer or hard drive. May be you can find somebody a friend or even family member that have computer knowledge and could at least just copy your files recovered from your old hard drive onto a new one. My Father had a computer that failed and the repair guy told him he needed a new computer that all was lost. My Daughter and I looked at the hard drive and were able to recover his files. My Daughter fixed the Fan (that was the only problem) and all was working again. So now I know always have a 2nd opinion when comes to computer repair guys ;-)