If you are using a professional program and switching computers for any reason then you will need to reinstall all of the prior year programs to open the returns and work on them. Hopefully the system you used also saves the returns as PDF files which you should have been backing up to a secondary storage medium. Using that medium you should be able to transfer all the PDF and .taxfiles to the new computer system just like you will for all of your other data. I have a backup hard drive that backs up my entire system AND a duel deck server (so my info is saved no less than 3 times daily) ... if you are in the income tax business you need to take precautions to save and safeguard your sensitive information. Seek a computer geek if this is beyond your knowledge base.
