[gvarndell]

You should make a copy of your current workspace directory and then try to import the projects you want to get back.

In the project explorer view, right click and then select Import from the context menu.
That will pop up an Import dialog.
There you should select General->Existing Projects into Workspace -- click Next.

The dialog will change and you want to select "Select root directory" and click the Browse button.
Browse to c:\windriver\workspace and then click OK.
With any luck, you will be shown some number of (salvageable) projects.
Check those you want to recover.
I would try recovering just one project at first.
If it works out, then recover any others you need.
Please let us know how this turns out and don't forget to make a copy of the workspace directory FIRST!