MAKE A REGISTRY BACKUP
Start-Run-regedit
File-Export
Choose your desired Backup place and give a backup name.
Change the Export Range to ALL
Click Save.
Restoring
Start-Run-regedit
File-Import
Browse the Backup file
Click Open.
Note: During restoring the Programs that installed Before the backup Date will work
MAKE A SYSTEM RESTORE POINT
Start-Programs-Accessories-System tools-System restore
Change the option to Create a restore point
Click next
In restore point description give the current date.
Click create
Restoring
Start-Programs-Accessories-System tools-System restore
Select the option Restore my computer to an earlier time
Click next
From the calendar choose the Restored date.
Click next.
Note: During restoring the Programs that installed Before the Restored Date will work.