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How to fix Windows Update error 0x800f0900

With the installation of Cumulative Update (both KB4493437 and KB4499167) for Windows 10 Version 1803 x64-based Systems, some users were forced to witness the error code named 0x800f0900 after failing to install the pending update. Usually, such updates are meant to fix previously existing bugs or errors, however, there are many cases when fresh patches bring new problems instead of solving the old ones. In most cases, users struggle to get rid of the issue for such reasons: missing or corrupted files, malfunctioned services, configuration issues, and other problems prompting the error. To solve it, we have prepared a list of instructions approved in rectifying the 0x800f0900 issue effectively.

How to remove Optical Rate Pro (Mac)

Optical Rate Pro is an unwanted web application that alters the settings to promote a number of browser changes on Mac. The most obvious change is related to the addition of a new search engine. Optical Rate Pro does it to insert sponsored content like ads, banners, and so forth. Also, regarding search queries entered by users, Optical Rate Pro redirects them through a chain of unwanted pages until you finally end up on legitimate Yahoo, Bing, or Google platforms. The reason why Optical Rate Pro does it is that developers need an intermediary engine to generate fake traffic. Then, once you get a couple of clicks using Optical Rate Pro, the developers will be able to earn some money on you. If you try to reset the settings using traditional ways, you will be promoted by a message like "Optical Rate Pro is controlling this setting". You will see it each time unless the unwanted program is removed. The last, but not least threat imposed by Optical Rate Pro is data collection. Because it operates as adware and a browser hijacker having access to browser settings, it can record and sell personal data like passwords, IP addresses, geolocations, and other types of sensitive intel. This is why it is necessary to delete Optical Rate Pro from your computer as soon as possible.

How to remove

0 (,, is a malicious website that displays tenacious ads and forces users into allowing some sort of action. Typically, these pages are visited inadvertently because of potentially unwanted applications that configured browser settings. Potentially unwanted programs are very annoying and cunning in terms of their operation. They secretly gather user's data such as passwords, IP addresses, geolocations and sell it on platforms like the darknet. Also, the opened domain will attempt you to click on the "Allow" button (to watch a video) which will result in a jet of ads appearing right on the desktop. Such ads may seem innocent and even useful, however, they usually contain malicious redirects to numerous websites aiming to spread other infections. Thus, to prevent seeing on the startup of a browser, you should follow free guide removal in the article below.

How to remove Search In Tabs (

Search In Tabs is a browser extension usually installed to Google Chrome along with bundled software. It acts as a browser hijacker, replacing the default search engine with and as adware, generating ads and pop-ups on various websites. This means that users are more likely to receive Search In Tabs by accident rather than on purpose. This makes such applications categorized as Potentially Unwanted Programs. Analyzing the behavior of Search In Tabs helps testify its hijacking abilities. The most obvious traits are the change of a search engine and the display of unwanted banners whilst surfing the web. Search In Tabs does employ advertising networks to show various ads in favor of revenue gains. Unfortunately, these ads are often embedded with links redirecting users to shady or dangerous pages. Also, a good point to mention is that browser hijackers have data-tracking abilities. It means that users impacted by such an infection may also be tracked by cybercriminals for passwords, IP addresses, geolocations, and other types of data collected. Bearing such a threat, Search In Tabs can damage your privacy and make you a victim to make money on. This is why it is important to remove Search In Tabs and everything related to it from your PC as soon as possible.

How to remove Bar1 New Tab (Mac)

Bar1 New Tab is an unwanted application that integrates into browser settings of Chrome, Firefox, Opera, and Safari after successful installation. Its capabilities are very similar to traditional browser hijackers that change the UI (User Interface) appearance and sets up a new search engine. Bar1 New Tab does not impact the visual appearance too much, instead, it tries to look as identical to default homepages as possible, so that inexperienced users could not spot the difference. On paper, it looks like nothing has changed, but it does when users start surfing the web. Getting further into the usage, people detect unexpected redirects to suspicious pages, suspiciously bigger amount of online ads, pop-up windows, messages, and other traits saying that something is wrong. Whilst Bar1 New Tab may not be able to harm your system itself, the changes imposed by it certainly can. Content generated by Bar1 New Tab can expose your data to third-party ventures seeking data collection (passwords, IP addresses, geolocations, etc.). This is why it is important to delete Bar1 New Tab and restore your browser settings as soon as possible. If you struggle to do it on your own, we have prepared a guide to help you down below.

How to remove ExpandedLibrary (Mac)

If your browser appearance has changed for unknown reasons, then maybe it got infected with adware and a browser hijacker. ExpandedLibrary belongs to this exact category of unwanted programs as it alters certain browser settings and sets up a new search engine ( This search engine is not independent like Google or other legitimate engines. Usually, it is linked with legal engines and acts as an intermediary to redirect queries of users. By employing this type of technique, cybercriminals are able to generate fake traffic and get revenues from content searched by users. ExpandedLibrary changes your search preferences and other UI settings to serve advertising banners without consent. Stealth infiltrations like ExpandedLibrary would not pursue monetary benefits unless they were distributed in a fishy way. Keep in mind that all browser-changing applications like hijackers are also capable of running data surveillance. This means that the unwanted program might record data entered during the session. To prevent such privacy threats, we recommend deleting ExpandedLibrary from Mac as soon as possible.