A few days ago my AVAST scanner gave a virus message: c:\windows\TVTMD.exe.
VIRUS NAME : win32:Trojan-gen.(UPX!)

The problem is that after deleting the file (after transferring to the Virus chest- deleting is not possible : message:“can not process “C:\windows\TVTMD.exe””) the message re-appears when restarting my PC and so does the deleted file (sometimes I find -besides “the c:\windows\TVTMD.exe”one or two files infected by the same virus).

Who can give me information about this virus (is it a real virus?) or this file.
How get rid of it ?

Thanks
jago