Microsoft promised a very smooth upgrade process from Windows 7 and 8.1 to Windows 10, but for various reasons, that's not happening on a number of computers, which are getting all kinds of errors either during the install or once the operating system has been deployed to the PC.

And because of these bugs, Chinese security companies Qihoo 360 and Tencent have both decided to remove the download links for Windows 10 until Microsoft manages to address them and provide the smooth upgrade it has promised.

According to reports coming from China, both companies were delivering Windows 10 in China for Microsoft, but after local users started complaining about issues discovered in the operating system, both have decided to remove the download links indefinitely.

Most complains were related to synchronization options - which, according to Chinese sources, failed to work and migrate data from Windows 7 or 8.1 to Windows 10 - and to OS performance, as many users claimed that computers were freezing all of a sudden after installing the new software. More, some say that reboots occur occasionally in Windows 10.

The let's-kill-Windows-XP effort

In China, Microsoft still has a very hard time getting people off Windows XP, as it's estimated that nearly 30 percent of the computers in the country are still running this old OS version that no longer receives support since April 2014.

At the same time, the company is also trying to tackle the issue of piracy, which still impacts its sales significantly in China. Former Microsoft CEO Steve Ballmer said that 9 out of 10 Windows licenses in China were pirated, so it's easy to see why the company hopes to see most local computer users moving to Windows 10.

Right now, it's not yet clear whether Microsoft has managed to address these bugs in China in order to resume downloads for local users, but we've contacted the company for a word on this and will let you know about their answer very soon.

nice! but why to installl windows 10!benefits 0! Cortana or? I have tested it in vmware working fine. when come sp2 i will migrate to windows 10 ! windows 8(8.1) have it on 1 machine but i am disappointed!(waiting for sp3) only update for windows 8 to 8.1 is it a 4 gb...halo ..Bill you're a little drunk or what! sorry for spam.. great post by the way!