HT4527 How to Deactivate PC Computers that no longer exists

itunes shows I have 3 PCs in use with all my purchases and downloads.  The fact is, I only have one computer.  The first was an Alienware Laptop that suddenly died without any warning 4 or 5 years ago.  Another was a new desktop I had installed iTunes Ver 10 on and had planned to transfer songs I had previously backed-up onto CDs to.  However, Windows 7 files somehow became corrupted before I could do anything.
The current computer I an using is a PC with Windows 7 Ultimate x64 OS.  I installed the most recent version of iTunes Ver 10 for Window's PCs.  In attempting to learn how to us the backup CD's created 4 or 5 years ago with the old Alienware Laptop, I went back into my old account, updated it.  I then found, somehow, all of my previous purchases and downloaded them.  By this time, the orginal iPod Classic I had been using had also died.  I had purchased a new iPod iTouch 64 GB and was able to download my previously purchased songs plus I purchased another 50+. 
Rather than deal with the old backup CD's, I am just going to go back through my CD collection and re-import songs.  There were a lot of songs I had previously imported onto my old iPod and did not want on my new iTouch.
I am downloading and reading but still have not found the area that tells me how to deauthorized the other 2 PCs that now longer exist.  Any Assistance on how to correct iTunes to show the only 1 PC that is being used would be appreciated?
Thanks, Michael J.

You cannot, nor is there a reason to, until you reach the limit of 5.
Once you reach 5, then you can deauthorize all, then authorize the active computers.

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