RAD issue JRE System Library[JavaSE-1.7](unbound) java build path is missing


My RAD has been uninstaled and installed back due to some issues. Now when i go to my workspace and see all projects have error like

 JRE System Library[JavaSE-1.7](unbound)  java build path is missing

I right clicked on each project -->properties---java build path--library changed jre 1.7 to jre 1.6.

My computer has below

C:\Program Files)\Java Runtime Environment (JRE)\jre6\bin

How to set on all project in one stroke rather than setting on all 10 projects individually. Please advise
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In eclipse go to the Windows > Preferences > Java > installed JRE's.
Then make whatever JRE you need as the default.

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gudii9Author Commented:
In eclipse go to the Windows > Preferences > Java > installed JRE's.
Then make whatever JRE you need as the default.

that seems did not work for me. Do i need to restart IDE to reflect changes.

instead of websphere application server v8.0 jre i gave my jre path till
C:\Program Files (x86)\Java Runtime Environment (JRE)\jre6
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