3 ways to speed up computer:

1. delete Temporary files from following path:
   
   a)  go to > all programs> run> type --->     %temp%
       and delete temporary  files

   b)  go to > all programs> run> type --->     %HOMEDRIVE%%HOMEPATH%
       goto My Recent Documents (if disable, then enable, tools> folder options...> view tab>  show hidden files and folders mark) 
       then delete temporary files

   C)  go to > all programs> run> type --->     inetcpl.cpl
       then  browsing history > delete

       note : many virus are lyeing in temporary files, so time to delete them. i am explaining that how to deleted temp. files.