I'm getting what looks like a windows sytem window
click to make it bigger
Critical systems error
Your browser has been hijacked by Trojan.Win32.Agent.akk
You need to clean your system immediately, in other case it can be crashed soon!
Click OK to download high-tech antispyware protection software! (recommended)
The grammar is too bad even for a Microsoft warning and exclamation marks aren't normally used by MS
Anyone seen it before and anyone got an idea of how serious the popup is and how to find it and get rid of it?