The D recovery disk is probably storing the system image of your installed operating system. It isn't growing larger on you is it?
Since it's brand new and from HP it's probably loaded with a bunch of junk software which is clogging the system.
Download a free application called PC Decrapifier and run it. Then you can safely uninstall any useless software which you decide you don't need.
Also the antivirus program may be causing issues too.
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Almost forgot my manners too!
Welcome Kim Dennis to the Windows 7 Forums website!