Trying to connect HP Laserjet 2100 (works fine with XP) to Pavilion dv7 with Win7 64 bit Professional. I downloaded the PCL5 driver from HP but it will not print. I am using a Manhattan parallel to USB plug plugged directly into laptop. What am I missing?

Did you download the Win 7 64 bit drivers for this printer. If not i suggest try downloading the drivers from the following link

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=14914&pr...

Check the USB connection
The icon on the USB cable ( ) faces up when the cable connects to the product correctly. Check the back of your product and the back of your computer to make sure the USB cable connects correctly and securely.
After you make sure the USB cable connects correctly and securely, review the following guidelines to check other potential USB-related problems:

• USB ports on the keyboard. USB ports on the keyboard and in the front of some computers might not be powerful enough to support the product. If the USB cable connects to the USB port on the keyboard, try connecting it to another available USB port on the computer.
• USB cable length. HP supports USB cables less than 5 m (16 feet, 5 inches) long. However, a USB cable that is 5 m (16 feet 5 inches) long must be of high quality. Otherwise, HP recommends using a USB cable that is less than 2 m (3 feet, 3 inches). Do not use patch cables to increase the length of an existing cable. Use a powered USB hub if you need more length.
• Alternate USB ports. Connect the USB cable to another port on the computer to make sure that the USB port on the computer is not the cause of the problem.
• Defective USB cable. Replace the USB cable to make sure that the existing cable is not defective.
• Conflicting USB ports. Disconnect any other USB printers, USB scanners, USB cameras, and any other USB connected peripherals. Start reconnecting these devices one at a time to determine if one of the devices is using too much power. Consider purchasing and installing a powered USB hub if necessary. NOTE: A USB-powered hub is a device that increases the number of available USB ports on a computer and facilitates communication between the USB devices and the computer. A powered USB hub can resolve communication failures between some, but not all, USB chipsets and HP products.