If your PC is taking long to open do this

You've installed may programs and some run as daemons(processes) at bootup,(may b u even have viruses) so that pc takes bloody long between logging in and having a useable desktop. here is a workaround
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a) run msconfig go to the startup tab and uncheck unwanted programs. apply changes, click ok to reboot
 b) run regedit 1) navigate to HKEY_CURRENT_USER\software\microsoft\windows\current version\run. here u'll find programs that run when the current user has logged and these programs could differ by user eg internet cafe timing software.

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BACKUP THE KEYS BEFORE U PROCEED BY RIGHT CLICKING, EXPORTING AND SAVING THE KEYS
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3) on the right pane, delete the keys of programs/processes u dont want to run in the background consuming your RAM and CPU time. but BE CAREFUL not to delete system process eg those located in C:\windows (Although some viruses could also hide there
2) while still in regedit, navigate to HKEY_LOCAL_MACHINE\software\microsoft\windows\current version\run. here u'll find programs that run at boot up irrespective of the user who's logged in eg antiviruses.... do the same as above