not start pc

[Rajubhai Ramvani]

dear sir,
       some websites are not open like speedtest.net and massage was
displaying update java othervise uninstall java and reinstall java so i
uninstalled java .now i start the pc the pc is not starting pc only going
booting process .how can i solve this problem.anybody can help me.i am
using kubuntu 11.10.
rajuramvani.
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