You don't tell WHAT you try to copy, and that makes it impossible to try here. Moreover, I don't have Works installed. It came with many PC's and never installed it (if it came on CD only) or uninstalled it (if it came installed). So I couldn't try it anyway, but maybe someone else could.
This once again, in my opinion, proves that MS Works is a suite of programs to forget, uninstall and not use.
Why not download OpenOffice or it's newer cousin LibreOffice? Bot are free and probably work better for this purpose, and they have the obvious advantage they can make documents (and spreadsheets and presentations) that everybody can read (they can save in MS Office format), while there's nobody (except you) who can read MS Works stuff. A nice feature if you want to share your work with somebody else.
Kees
Just more info. Trying to copy out of Firefox and paste into windows and I get this error message.
Windows 7
Firefox browser
Microsoft Works 2004
3 GB of Ram

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic