My computers sending spam

[Muffin`]

I've had a few people tell me I'm sending spam to them from my hotmail account. I've searched my machine with every free scanning tool I can think of (all the major AV companies, Spybot, malware bytes, ad-aware) and I can't find anything!

Any ideas?

 

[Muffin`]

Right changed that now and all that jazz, thanks.

I have Win 7 x64 so I don't think that software is applicable, thanks anyway

 

[Muffin`]

Remember don't just change your password, you need to change your security questions(s) and possibly alternate EMail address to prevent the account being hijacked again .

yup done that


I had a look around the account and the last message sent was actually part of my signature so it looks like its a blank body with the spam in the sig :S