I'm not certain exactly what you want to do but you can manually create a
system restore point at anytime by accessing the System Restore wizard
located at Programs->Accessories->System Tools->System Restore->Create a
restore point
Alliteratively you can copy the lines below (not including the dashes) into
notepad and save it to your Desktop as SR.VBS
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Set SRP = GetObject( "winmgmts:\\.\root\default:Systemrestore" )
CSRP = SRP.CreateRestorePoint( "Before Changes", 0, 100 )
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Just double click the .vbs file and it will automatically create a system
restore point called "Before Changes"
If you want you can create a Scheduled Task to run the .VBS file at the time
of your choice by going to the Control Panel->Scheduled Tasks->Add scheduled
Task and browse to the Desktop location of SR.VBS