Thanks,cocochepeau for your reply.
Everything was fine with my desktop Windows 7Home Basic Edition Update feature and all the updates were duly installed .Last night I ran the Malwarebytes Free scan and some PUPs were detected which I deleted.I also had ADWCleaner installed and that was used to confirm the deletion of any PUPs.
Today morning,I -just out of curiosity-installed and ran the WinUpdateFix.After that,the Update feature indicates--YOU HAVE NOT TRIED TO INSTALL ANY UPDATES FOR YOUR COMPUTER. ( Under,VIEW YOUR UPDATE HISTORY) .Yet,under Installed Updates, the updates are seen till 4th November. Now what has happened and how do I resolve this? Thanks,