Where did this Folder come from?

I have this folder I have never noticed, it is c:/windows/assembly. And, you know how when you go to any folder where it tells you the name of the file, size, description, and etc.(I know there is a name for it, just can't recall it.) You are also able to move your mouse cursor over this part and be able to select what parts of the file you can view in the folder.

Well, in the assembly folder you can't select what you can view of the file. Only thing it says about the file is, Assembly Name, Version, Culture(nothing shows up in this column), Public Key Token, and Process.

I will let you in on this, I just had a new hard drive put in Sunday. I was not able to back anything up from my other hard drive. Even when I had gotten home I had not backed anything up yet. About 40min. after hooking it up McAfee popped up about 5 notifications of Trojan removed. Then a red circle appeared in the start bar, then Home Antivirus 2010 tried to install, ARRRGGGGHHH!!! I have had experienced with its predecessors, nasty little buggers. Luckily it has not installed yet, I have done a search for all the files that are supposed to be in the registry and in the folders and none has shown up. On occasion I still get the notice of Trojan removal. I immediately run Maleware and I recently installed SuperAntiSpyware and have run it.

But what about this folder, is this something that should be there or not?

 

I wasn't going to do anything with it until I found out what it was, I had a feeling it was normal, just have never noticed it. Thanks for the info, yeah I know I am infected, I just hate that it had to happen right after I brought it home from having a new hard drive put in.