kromtech.net is causing all the ads to appear on your screen, as it's an ad-supported program. It's likely that you don't remember installing it, which indicates that you could have acquired it when you installed some freeware. Normally, an ad-supported software isn't a quiet threat, so you should be able to understand what is going on quite quickly. The most obvious sign of an adware is the constant advertisements popping up when you're browsing the Internet. You may encounter pretty invasive advertisements, which will appear in all kinds of forms, from banners to pop-ups. It should also be noted that even if an adware isn't categorized as harmful, it's possible it could redirect to you some malware. Before you encounter serious trouble, terminate kromtech.net.
You unintentionally give the advertising-supported applications authorization to set up, which is why you may not even notice its installation. The set up happened via application packages, potentially unwanted software are added to freeware so that they could install along with it. Keep a couple of things in mind during free application installation. Firstly, adware might come together with the free programs, and by using Default mode, you basically grant it authorization to install. Second, if you want to regulate what gets set up, use Advanced (Custom) mode because they will authorize you to untick all added items. It is easier to uncheck the added items than it would be to remove kromtech.net later on, so take this seriously.
The advertising-supported software will start filling your screen with adverts once it sets up, and that will be quite noticeable. Some may not even note a growth in ads but if they display "Ads by kromtech.net" constantly, that is a big sign of an adware, and thus you would have to erase kromtech.net. Most of your browsers, like Internet Explorer, Mozilla Firefox or Google Chrome, will be affected. After some time, the advertisements could also become distinctly more personalized. Info about your browsing habits and interests is gathered, which it then uses to generate ads for you. An adware will primarily attempt to make profit from advertisements but it could occasionally lead to severe contaminations. An ad-supported application might occasionally lead you to dangerous websites, and you may end up with a malicious program without even knowing. Your best course of action right now is to remove kromtech.net, and the quicker you do it, the better.
You have two ways to delete kromtech.net, and you need to choose the one you are most comfortable with. If you choose to eliminate kromtech.net by hand, you would need to find the contamination yourself, which may cause trouble. Scroll down to find instructions to assist with by hand kromtech.net removal. But, if you don't feel confident with it, you can use a capable deletion tool to terminate kromtech.net.