It turns out that Kaspersky Lab has a free online antivirus. Utility works directly in the browser using Java. So as an online tool and Kaspersky Anti-Virus using one and same, constantly updated database, then check the expected high quality.
To run the scanner, just go to the website of Kaspersky Lab's here: http://www.kaspersky.com/virusscanner. Next, you just need to run the online application.
The program will load into memory a few files, and connect the latest antivirus library. After that will be available scanning mode, which involves scanning a particular file, folder, a quick scan of critical areas of the computer, and full scan. If you absolutely can not wait until the scan is over, and need to check only a single file, then there has online checking individual files.
If you were attacked by a terrible virus, and still liquidate the consequences of the infection (something does not start, something is not enough), I advise you to look here: http://www.kaspersky.com/removaltools
. On this page, Kaspersky Lab has posted a free tool for removal of all kinds of malicious programs.