Hi all, thanks for the reply,
I managed to get it off with Malwarebytes after a manual update (forgot the the free edition doesn't auto update

)
EricJH - You're right, it wasn't the file, Winudpmgr is for Windows update manager (I'm such a dunce) but the reason I couldn't check the file properties was because it doesn't appear in the Windows directory even with hidden files set to show, so sorry, couldn't get any info on it.
Kail - I remember when I googled and looked at the ThreatExpert definition it did say it was nasty, but it was referring to win
updmgr, so I got confused, especially when win
udpmgr turned up zilch anywhere on google or ThreatExpert - even that winudpmgr was a system file (though after some system monitoring i realized it was the vista update manager)
JamesFrance - thanks for reminding me about updating MalwareBytes, it identified it as a
Backdoor.bot that had hijacked windows update.
So thanks for your help you guys, if I hadn't had your replies to kick some common sense in to me I'd probably still be threatening my laptop with the hammer lol