Microsoft is doing a "nag campaign" to convince users to update to Windows 10, now set for release on July 29 for free. The company inserted a certain app that would remind them to reserve and download the free operating system; however, many were annoyed about it.

There were users who were able to see ad-like screens that remind them to get the latest OS. This was said to be contained in an application called "Get Windows 10."

Termed as a "nag campaign," news about it went out first after Myce.com spotted the notification, then rooted back to a March 27 update that was downgraded to Windows 7 and Windows 8.1.

A certain upgrade (bearing version KB3035583) brought the app, which it was marked as "Recommended" for some machines. This means that it was automatically downloaded and installed where Windows Update were left with its default setting intact. But the update was optional on most PCs.

On May 14, Microsoft reportedly changed update KB3035583 to Recommended for all qualified devices. Now, the company "flipped the Get Windows 10" switch. The app would execute its scheduled task by appearing after a user logs in, and it would refresh everyday at 8 PM local time.

However, not all were happy about the campaign that Microsoft is doing. Users took to Reddit expressing their annoyance about the "nag campaign."

Nevertheless, the app can be removed by uninstalling KB3035583 from the Windows Update pane.

Currently, machines running Windows 7, Windows 8, or Windows 8.1 are eligible to receive Windows 10 for free.

There won't also be any cost for PCs upgrading to Windows 10 Home that came from running Windows 7 Starter, Windows 7 Home Basic, Windows 7 Home Premium, Windows 8, or Windows 8.1.

Further, those who are using Windows 7 Professional, Windows 7 Ultimate, Windows 8 Pro, or Windows 8.1 Pro can avail Windows 10 Pro copies for free.

But for users running older versions of Windows OS such as Windows XP, or those who would buy a new PC, they will reportedly have to purchase a copy of Windows 10.

Microsoft is making Windows 10 free in one year starting from its launch date.