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open a command prompt as admin and navigate to c:\windows\system32 and type in this command

cslmgr.vbs -dlv > %userprofile%\desktop\act.txt

or u can also try typeing the following at command prompt

slmgr.vbs -dlv

(where userprofile is user name or u can specify any other location if you so desire but as this may not work everytime therefore i would recommend that you should download and use some screen capture software. In that case you need not type beyond DLV as the same would appear on your screen. Make sure that you capture the high resolution readable image of installation id)

on your desktop you will now have a file called act.txt in that file look for installation id it will be a 54 digit number in there, you will want to split it into groups of 6, you should have 9 groups of 6. Copy and paste that number into a text file because when you call the phone number you will need it.

Next you will need to open up phone.inf in c:\windows\system32\sppui and look for our country and then call the number. The automated phone thingy will ask you to input those groups of 6 and then spit out an activation key. Take this key and type it into your text file where your install ID is you are going to need it for the next step.

Open an elevated command prompt and type in slmgr.vbs -atp then the activation ID the phone number gave you. So if it was 1234 you would type slmgr.vbs -atp 1234 then once you do that windows will activate if your activation key is correct.