Once there can come that unpleasant moment when having visited the favourite, native website, you bewildered find the inscription ""There Is Information that This Web Page Attacks Computers!"" instead of familiar pages.
What to do in a similar case?
First of all you should contact technical support of the hosting provider: write the letter with a request to find out the blocking reason. If your website commercial and you every minute lose potential buyers, then it is better to accelerate examination process, - to call technical support of a hoster.
Also you should come into the control panel of the website and via the file manager attentively to browse whether was modification on pages of the website lately (view files with the .htm, .html or .php extensions).
Two factors can be the main reasons for the fact that your website was blocked by search engines:
1. You accidentally entered any malicious code on pages of the website. Sometimes for ornament and revival of the project it is necessary to insert dynamic scripts of galleries, forms of feedback, sliders, etc. As almost always we take already ready scripts, finding them in the Internet, there is a high probability of the fact that you downloaded and installed some file in which the unfair creator deliberately implemented a malicious code.
2. If you did not make any changes recently, then can be other reason of blocking of the website
penetration of the malefactor hacker into the file system of your resource for the purpose of installation of an exploit
(a malicious code which purpose can be implementation of trojans on computers of visitors of your website). Here already surgery of the specialist of hosting provider will be required.
Anyway this problem is quite solved and easily feasible. Most likely your provider will install not infected backup copy of the website, so-called ""backup"". However you should reconcile to the fact that at run from search engines the visitor still some time will see a warning sign. Everything will return to normal after the first visit of pages of the website the search robot, at Yandex such robot comes to the website at least once a week, at Google is more often - time in one-two days.