OK,here it goes,
1. You may want to install the Android SDK first and foremost so that you can run ADB commands(Android Debug Bridge)
2. Make sure you have the diagnostic drivers for the phone installed on your Windows 7, there is a difference between the normal operating drivers and the diagnostic drivers.(Usually when you install the Android SDK and update it, it will install them for you.
3. Like stated above, make sure you have the updated HTC Sync software from the HTC website.
4. Double check your device manager and make sure all drivers install correctly.
I'm an android guru as well as computers so thought I might help. You can check out www.xda-developers.com and check out their forums and there's much more information on the Android SDK and you could possibly download the diagnostic drivers from there as well. I have the same username in their forums if you would like to look me up. There's a lot of different stuff you can do with HTC phones and that's another story all in it's own. Read up on xda and find all the possibilities. Hope I could help out!!
EDIT: Just read your other post that I missed where you said you had the adb and sdk already. Try to find the diagnostic drivers. They let you work with the phone much more than what the standard drivers provide. Diagnostic drivers=success!
Edited by PS4AndroidHacker, 10 April 2013 - 01:19 AM.