If Your Windows Xp,2003 or VISTA take toooooo Long To Boot.I mean The boot Screen Take Too Much time then follow these steps to Fast Up Boot Process of Your P.C.

Just Go To RUN TYPE REGEDIT  PRESS ENTER GO TO HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
ContentIndex

ON RIGHT PANE DOUBLE CLICK ON StartupDelay then click on 
Decimal then change the value to 40000 Close and restart the P.C.