Run some antispyware software (after updating) such as Adaware or Spybot (both are free). Also update your antivirus and scan. Defrag. Close anything you're not using and disable annoying things at startup that you don't actually use (audio tools, msn, etc). Also run a reg cleaner
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I should have told that in 1st post, This laptop does not get connected to web too often, but still I have AV, spybot, adware, & before posting defraged it & yes every week the reg cleaner is run.
Infact whenever I opened LR i use to shut down every thing which was in start up, but cpu 100% remains same.
Thanks for the help.