Tell me a better PC emulator and I'll pay you!
There are lots emulators out there. Check the following:
1. StarNet's X-Win32 (my favorite. thats what i'm using at work with sun's solaris)
2. Hummingbird's HostExplorer
3. Tarantella's Secure Global Desktop
They all don't work with all the *.nix distributions. Check the product datasheet to find out the one that works with yours.
Hope that helps. If you need additional information, let me know.