Windows Pro Transfer from computer to computer on HDD?

[googalabosh]

SPECS:
CASE:Cooler Master CM Storm Enforcer
http://www.geeks.com/details.asp?InvtId=SGC-1000-KWN1-R

PSU:Logisys 480W 20+4-pin ATX Power Supply
http://www.geeks.com/details.asp?InvtId=PS480D-BLK

MOTHERBOARD:GIGABYTE GA-970A-D3 AM3+ AMD 970
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128521

CPU:AMD Phenom II X4 965 Black Edition Deneb 3.4GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727

VIDEO CARD:SAPPHIRE Radeon HD 6450 1GB 64-bit
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102933

MEMORY:Pareema 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820576011

HDD: 500GB 7200RPM SATA (Old Laptop HDD)
Note: Taken from an HP dv7-2270us laptop

I recently built this computer. I used my old hard drive from my HP dv7 laptop that was loaded with Windows Pro. When I started up the computer I was never asked to install the operating system. Infact when it loaded it loaded as if I was still on my laptop. The windows lock screen came up and showed my name. I entered my password and up popped my desktop. It had the background, all the icons, and I even tried some of the programs and they worked. I am not sure if this means that I already have windows pro or not and am woundering if someone can explain this to me. I have already purchased Windows 7 Pro SP1 to load but have not used it yet.

Can somebody tell me if I still need to load the new windows from the disk?

Am I ok to just keep going as I am?

If I keep using it like this will I still be able to get updates and use all normal functions of Windows Pro?

Is there anything I can do to check to make sure I have full functionality of Windows Pro?

Thank you all for your help.

 

[EarthDog]

SV1? You mean SP1 (Service Pack 1)? Also which version of 'windows pro' XP Pro, W7 Pro......

If its not bickering at you (yet?) to activate, then you are fine.

Try going to updates and see. Should be ok...

As far as functionality, use it and see if my best advice.

 

[googalabosh]

SV1? You mean SP1 (Service Pack 1)? Also which version of 'windows pro' XP Pro, W7 Pro......

If its not bickering at you (yet?) to activate, then you are fine.

Try going to updates and see. Should be ok...

As far as functionality, use it and see if my best advice.

Ha ha ha. I'm an idiot. It's Windows 7 Pro. Guess that helps huh? lol. Thank you for advice. I'll try doing updates when I get home. That should tell me if it's good.