My laptop was infected with a trojan horse. A file with 6123t.exe was found at c:\6123t.exe. This probably happened on 27 May.
Apparently the virus was origninated from some Chinese web sites with Adobe flash embedded. It is a trojan horse, a downloader that will download virus from the web. The virus exploits the security loophole in Adobe Flash (here). The flash version needs to be upgraded to version WIN 9,0,124,0 in order to patch this security loophole.