You don't say what version of Generations you are using? You could update to v8.5a and carry on with the same program on Windows 7.
Alternatively there is another program called Family Historian that we now recommend as a modern alternative to Generations. This is what we say about it:
Generations has been a brilliant program over the years and because of it’s ownership by Ancestry in America who favour Family Tree Maker they have not done any development work on it for some considerable time. Although it will work on Windows 7 the program is now at least eight years old. We have stock of Generations 8.5a for customers who do not want to change to a new program. However there are many like you who wish to use more modern software so please read on.
At long last we feel there is a program that replaces Generations and improves upon it.
Please take a look at Family Historian 4 (released April 2009). It handles images in a much better way than any other family tree program and almost has the complete functionality of your old program. The new version 4 looks a lot more like the Generations program including images on the family screen.
You may download a 30 day trial version of the new Family Historian and import a copy of the Gedcom file that Generations is able to produce from the file menu in your old program. Your data may transfer without any problems but a few Generations users have experienced dome sources moving over without their titles. We have a program here that will fix a few errors on the sources including most ‘titles’ and ‘repository’ data fields when transferring into Family Historian. If you do experience any of the above problems, for a small extra charge of £8 per file we are able to convert the source data from Generations to be more compatible with Family Historian.
Have a play with your own data in Family Historian and see what you think. Here is a link to the page on our sister website where you may download the 30 day trial: