You should have taken SANDRAXXX' advice to just soft reset...
Thanks but still Not working...
So
Deleted c\sys\install\sisregistry\ whole folder...(otherwise it say....update error)...restart phone....
Reinstall Compass widget.....Now Working...
:-p
btw
i think....if...now i want to uninstall previously installed app.....it won't uninstall.....m i right??
But its good trick to....avoid all type of installation(except Certificates) error....