Jeff,
Can you copy and paste your installation details here? I was researching over the net for VSS 1.6.2 plugin for Eclipse. And I came across this link – http://sourceforge.net/forum/forum.php?forum_id=733814 If you notice, it says that it supports Eclipse 3.3 Europa. I understand that you are using MyEclipse 7.1.1, which is based on Eclipse 3.4.1 Ganymede. Can you find a relevant version of eclipse plugin for VSS which supports Eclipse 3.4.1 Ganymede?
There are ways to add plugins to MyEclipse. If you have an update site. Here is the instruction to add a plugin –
1. Help > Software Updates > Add/Remove Software
2. Click on [Add]
3. Click on [Add Site]/[Add Local]/[Add Archive]
4. Enter name of the plugin
5. Enter update site URL
6. Click on [OK]
7. This will list your plugin under Personal Sites.
8. Select the plugin to be installed and click on [Next] and [Launch]
9. After the plugin is installed it will prompt you to restart MyEclipse. At this point it is recommended to restart MyEclipse
If you have a .zip file containing plugins/features releated to the plugin to be installed. You can copy and paste plugins and features to [MyEclipse installation dir]/dropins. (If you don’t have folders named plugins/features, it is recommended that you create them under dropins and copy and paste relevant plugins/features to their respective folders)