I have a Solo 2550 with Win2k on it. The only driver install file I have is for the display.
It really shouldn't be necessary to have the original drivers though.
As mentioned before:
Video is Silicon Motion LynxEM
Sound is ESS Maestro2E PCI
Everything else is just standard stuff.
There is a driver CD available on Archive.org which may have the needed drivers though it doesn't specifically cover the 2550:
https://archive.org/details/gw2k_drv
(Audio should be the same as the 9300)
I'm not seeing the video driver on that CD though.
I did find a copy of the driver for that video chipset on driverguide though:
The attachment silicon_motion_lynx_family_driver_win9x_nt_2000_me.zip is no longer available
And here is the user manual:
The attachment 2550.zip is no longer available
I kind of have an interest in the old Gateway SOLO laptops because I have the fancy dock that has PCI and ISA slots.