Having touchpad auto disable when external usb mouse is present

Apparently as hardware and drivers change this feature got dropped. Just purchased a Probook 450 and was very used to my touchpad having the option to turn off when a external usb mouse (logitech wireless) was plugged in. This new system had no such feature and I spent several hours searching for a solution of reason why.
Finally found one I took a shot on that worked just like I was used too. Now when usb mouse is inserted the pc pops up message saying touchpad disabled and when unplugged the touchpad comes back on and pc pops up message saying pad enabled. No software change. No hardware change. Just a simple registry edit and feature back on.
Seems after doing my searches I might as well share this info for those looking for the answer.
***disclaimers***
*make sure your usb mouse works before you do this because if it dose not and this fails to work or you do it wrong you may have no "mouse" to navigate with.
*warning- editing the windows registry is not something for the clueless*- errors can cause major problems that said this is a very simple simple fix and hp should just perma fix it for all synaptics touchpad laptops.
*can not test this with non synaptics touchpads tho it may work if you can find the registry entry for that brand*
*this was done on windows 7 system with Synaptics touch pad and my prior one was windows 7 and so was my wifes dell laptop, all Synaptics, all Windows 7- no clue on windows 8 or vista*
*if someone has found an easier fix post it because took me hours to even find this*
Windows 7 OS- Start menu- in the programs and files box at bottom type "regedit" without the quotes and press enter.
Click ok to continue on popup box. Window comes up with your system registry. Expand the "HKEY_CURRENT_USER" then expand the "Software" then down to the "Synaptics" and expand that one. Left Click on the "SynTPEnh" and to right will open the sub entries. The one your looking for is "DisableIntPDFeature". Just write down the last two numbers in the ( ) at far right of this line incase this does not work so you can put it back to what it was. Once you wrote it down, now you can change it- right click on the DisableIntPDFeature and a window pops up. Left click on "Modify..." then in new popup window on right side left click on decimal and in the window on left of this popup type in the numbers 51. Left click OK once numbers entered and close it and and then close the whole application and reboot. Done. System should auto switch from usb mouse to Synaptics touchpad.
If it does not work I am sorry- follow the above steps and type back in the number you wrote down before the change and save and reboot or reinstall the mousepad driver for your system from hp.

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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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hi whippetguy,
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