The cd should say whether it is home premium, professional, or ultimate. You could always boot of the cd and choose install now. You may have to click yes once, but it will be on the screen where the Microsoft software license terms are. It will say "Windows 7..."
Computer type PC/Desktop System Manufacturer/Model Number HP Pavilion P7-1010 OS Windows 7 Professional x64 Service Pack 1 CPU AMD Athlon X4 645 Motherboard Foxxcon N-Alvorix RS880 Memory 6GB DDR3 1066 Graphics Card Sapphire Radeon HD 5670 512MB Sound Card Realtek Integrated Audio Monitor(s) Displays HP 2011x Screen Resolution 1600x900
Keyboard HP OEM- Made by Chicony Mouse HP OEM- Made by Logitech PSU Seasonic S12 II Bronze 380 Watt Case HP OEM Cooling Coolermaster Heatsink, AVC Case Fan Hard Drives 1. Crucial M4 128GB SSD
2. 1TB Seagate Barracuda 7200.12 RPM
3. 1TB Western Digital Caviar Green 5400RPM Internet Speed 20MBit Down/4 Up Antivirus Microsoft Security Essentials Browser Internet Explorer 9