If you can open the project then it has worked.
The error is likely due to missing libraries different Java
versions or other issues.
But we can not say what based on the description "too many errors".
Arne
well thats not the problem, please do it this way.
1. make sure you are in your default java perspective
2. right click on your project folder in package-explorer
3. select export
4. in resulting window click on general->archive file
5. then click on next ,it will show you option to find out what all
files you want to save in your archive
6. in To Archive File , type the name of project or name by which you
want to save the file
7. click finish.
this will export your project to zip/tar (whichever you selected)
now safely transfer your files to another system and then again in
your workspace
1.do a right click
2.select import
then import from a archive file and give path to your file
it will automatically import complete project to your current
workspace and will make all necessary path/settings
and if your target eclipse environment is same/better than previous
one, there should be no error at all.
hope it helps.
-Rishi