Yeah, the forums don't handle straight copies from Word very well. I'm not sure why, but I don't think that really matters.
Easy way round this is to copy into Notepad (or similar program first, then into the post. If I'm using Word to make a post, I'll normally copy into a Skype conversation window first as I normally have one open.
Ahh, if you're not sure how to access notepad. Click Start, programs, accessories and it should be sitting merrily away in there.
And your sig is way, way too big.
The only thing worse that beating a dead horse is betting on one.