Set WshShell = WScript.CreateObject("WScript.Shell")
Do While True
WshShell.SendKeys("{SCROLLLOCK}")
WScript.Sleep(174000)
Loop
Save above content with vbs extension in Notepad.
Paste this file in startup folder, so that it automatically runs whenever you start your system.
Goto run (Windows Key + R ), type shell:startup
This script, press Scroll Lock every 2.9 minutes (17400 milliseconds), so that screensaver doesn't appear.