Open REGEDIT

Navigate to 'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run'

Create a REG_SZ value named after your program, with the value being the path to the executable file (for example, 'C:\yourprogram\yourprogram.exe')

Your Done!...

OLD WAY:

First, make sure that you have enabled the 'Show hidden files and folders' option.

Navigate to this path: C:\Documents and Settings\YourName\Start Menu

where, YourName=Your User Name.

Paste shortcuts of the programs you want to run @ startup in this folder.

Your Done!..