Hi Zoron, yes, I'd searched on certmgr and did NOT find it included in Win7 HP, but you can get to a certificate manager interface via IE's Tools/Internet Options/Content. Not sure what this is called and I was unable to import the SSH cert that way.
However, I did find a way to run a secured connection (sftp) from MS Expression Web to my hosting site without importing the cert I'd generated on the hosting site. It involved making the connection using FileZilla, using just the hosting account id/pwd, THEN making the same connection within MS EXPREssion Web. The id/pwd gets associated correctly to a cert within FileZilla, that can then be used in the other app fairly seemlessly. MS EXpression Web just didn't have the capability of setting this up. These instructions were very helpful to me in this process http://www.howtoforge.com/ssh_key_based_logins_putty.
You could also try going the extra step of eliminating userid/pwd logins and JUST using key based security, as explained in this link. So, bottom line is I'm good. I chose a differnet program for the png compression and found a work-around to getting a secured connection between my hosting site and myself.