the short answer is, no.

The qualified answer is, yes, there are windows emulators, but there are also versions of some softwares that run under windows that have also been ported to linux. For instance, Trillian doesn't have a linux version, but GAIM is a great linux solutuon for that. As for your games, I'd say that you should see if the games have Linux versions, running them under such emulators such as Wine, would be problematic at best.

As for other software that runs under linux and windows, for instance, Office, there's OpenOffice, as well as a few other software distro's that are similar.

Some games etc as well as utilities are such have been ported, I'd recommend going with the ported software rather than an emulator.