If your installation is freezing at 62% then it appears you're doing an "upgrade" install instead of a "clean install" or custom install. Quite a few people are having issues when doing an upgrade install. I would suggest doing a clean install, plus Windows 7 works much better when it's installed that way.
If you only have the "Upgrade Version" discs don't worry, the full OS is still on them. I have done three clean installs with upgrade discs with no problems and no issues with activation. One hint that helps is DON'T put in the product key or a password, when asked by Windows 7 during install. Let it finish installing and do any automatic updates until all updates are finished.
Then go to to Start Orb, Computer, Right-click then properties, you'll see the Windows Activation area in the lower right-hand section. Click on "Activate Windows Now" section and enter Key and activate, you should be good to go.
Operating System Windows 7 Professional x64 Retail
Computer Type Lian-Li PC-7F All Aluminum Black Anodized Case
CPU Type and Speed Intel Core 2 Duo E8400 3.0 GHz
Motherboard Chipset Gigabyte EP45-UD3R Firmware F13e
System Memory Type 6 GB Mushkin Enhanced Blackline 2x2GB 2x1GB @ 1066 PC8500 5-5-5-15 Timings
Video Card Type and Speed XFX HD 5770 1GB DDR5 128 bit bus
Computer Monitor ViewSonic VX2250wm-LED 22" Widescreen @ 1920 x 1080p HD
Hard Drive OCZ Vertex 2 60GB SSD, Samsung F3 HD-502HJ & F1 HD-502IJ
Optical Drives Samsung DVD Burner SH-223F 18X
Network Adapter Airlink 101 Wireless N & RealTek LAN RT
Anti-virus Software G DATA Internet Security
Computer Skill Level Self-Taught Expert
Windows Experience Index 6.6