Same problem.Scanner does not connect to my PC with Windows XP

Did you plug the scanner's USB cable into the computer, BEFORE you installed the drivers?

This can lead to a driver conflict.
When a hardware device is connected to a computer, Windows automatically sets out to match up drivers for it. If no driver is found that ->directly matches the device, Windows matches up one of it's generic drivers. Kind of a "One size fits all", type of thing.

Then THE drivers are installed. Now Windows has a conflict of drivers.
Windows: "Do I use these, or THESE?"

Suggest you unplug the USB cable from the scanner to computer, (If plugged in) Turn the scanner off, and unplug it from power.

Then go to All Programs, (Start>Hover your mouse on All Programs), and look at the list to the right for the Agfa Snapscan software.
See if an "Uninstall" option is listed. If so click on it. (If it asks if you wish to save preferences - NO!)

If not, go to Add/Remove Programs, (Start>Control Panel>Add/Remove Programs), and find the Afga software in the list. Click on Remove.

DO NOT restart your computer, (Even if it asks)
Shut your computer down normally. (Start>Turn Off Computer>Shut Down)
Unplug your computer from power.

Press the Power ON button in, and Hold it in for a count of at least Five seconds. (Count, 1001,..1002,..1003,..1004,..1005)
Let go of the Power On button.
Do This ->Two more times.

What you are doing is clearing any CMOS Error Codes, (And resetting BIOS back to the factory default settings)

Plug your computer back into power. WAIT 1 minute, then turn it on.
After Windows has fully loaded, install the drivers from the CD disk you burned them to. If you didn't save the drivers to a CD disk, download the drivers again. Install them with the Installation Wizard.

After you're done, restart your computer.
After Windows has fully loaded again, plug the scanner back into power. If it sounds like it's resetting itself, wait until it's done. Now plug the USB cable into the computer from the scanner, turn the scanner on.