Which Seagate drive is this... size-wise? Did you get it in a box with a disc, or in a plastic enclosure with no disc. If no disc, you need to download and run the Seagate setup software. Otherwise, use the seagate CD first to setup the drive.
But if the Seagate laptop drive is large, your ACER BIOS may require an upgrade. The current ACER BIOS for the Travelmate 620 is VR01-A1C available from the Acer site. You should be able to look at your BIOS flash screen to see what current BIOS you have installed.
Beyond that, you have a hardware problem somewhere, or an infestation.
Since you are using an Acer laptop, your options are limited, but it will normally setup once the Seagate drive is prepared.
You can also use the Seagate software (disc or download) to totally remove the WXP stuff that is partially installed.
Does this TravelMate 620 of yours have a floppy drive? If so, this allows you to clean up the bad install on the hard drive and start from scratch.
If you have a floppy drive, and an old MS-Dos or Windows 98 System boot floppy, I would boot to the floppy, then use the choices that come up on the screen to go to FDISK. Use FDisk to delete the partition under selection choice 4 or 5 (I forget), then reboot to the floppy and install a new partition, then reboot and format the drive in FAT32.
If the drive formats with FAT32, you know the problem is not with the drive.
So you know there is no WXP residue ore residual errors, no infestation, nothing to interfere.
Go back to the WXP disc from a cold boot. Put the disc in the drive, and shut down. Now turn the Travelmate on and it should boot to the WXP Disc starting with a WXP NTFS format. If it gives you the choice of FAT32 or NTFS, select NTFS. That will take a long time.
Once WXP has run the NTFS format, it will reboot and begin installing Windows XP and you will have no more trouble.
However, you will still need to install all the drivers. If you have the Acer Applications and drivers disc, insert and run that disc. Otherwise, you have to download them from the
www.acer.com site.
If this doesn't work, you have either a memory, video graphics, chipset, BIOS, or hard drive error.