Get rid of Reserve Your Free Windows 10 Upgrade alert
NOTE: This method is applicable to both Windows 7 as well as Windows 8.
Step 1: Open Run command box by simultaneously pressing Windows and R keys.
Step 2: In the Run command box, type Appwiz.cpl, and then press Enter key to open Programs and Features window.
Step 3: Once Programs and Features window is launched, click View installed updates link located in the left-pane to see all installed updates.
Step 4: Now, under Windows Updates, look for the update titled KB3035583, right-click on it, and then click Uninstall to remove the update.
Step 5: Finally, close all running programs, and reboot your PC. That’s it!