Advent 7017 laptop major problems

Hi all, could anyone help me with my Advent laptop?

Specification
CPU Intel Pentium 4 3.06 GHz (Northwood)
BIOS AMIBIOS.
Memory 512MB PC2100 DDR SODIMM (2 memory slots. Max 1GB) ***
Hard Drive 40GB Toshiba drive)
CD Drive QSI SDR-081
Screen 15" TFT (Native Res.1024x768)
Video Card ATI Mobility Radeon 9000 64MB DDR **
Sound Card SiS 7012 audio chipset
Modem SmartLink 56K
Netword Card SiS 900 integrated fast ethernet

I don't know if this is definately the spec inside as it was bought off ebay cheap as it has some v minor cosmetic damage (missing hinge, v tiny crack to casing)

Apparently it's a rebadged Gericom Blockbuster 251S6?

It was bought primarily to surf the internet, and play football manager
Anyway, we turned the thing on, all good, then attempted to load some games on, football manager, age of mythology, nothing too bad.
Had some problems with graphics so downloaded Omega drivers?OmegaDrivers.net

Anyway, had problems with it, it kept crashing, random errors, blue screens etc so we did a clean install of winxp sp1, didn't put sp2 on cos had heard of problems with this machine with sp2 ie won't shut down properly etc.

Same problems, as soon as you try to do anymore than surf the web it crashes, freezes etc different messages and screens.

I've tried various diagnostic tests ,(Memtest 86, prime 95), but a)it fails them all! and B)I don't really know what I'm looking for!

I have various error files and minidump things if anyone can tell me which ones would be helpful and what to do with them!

All help and/or suggstions as to what direction to go in gratefully received!

Thanks

Angela

Hi, I bought a new stick of 512 and tried that by itself, and in different slots, it still failed memtest86+.
So unless I've been unlucky with the new ram then it must be something else.
It's a nice machine, and I'm still hoping I can sort it out, but I agree that it's looking for a needle in a haystack right now.

I'm particularly interested in the event codes it generates around the times it crashes, the most common is event 7023, source is the service control manager. Does this mean anything?
Like I can attach files and screen shots if someone tells me what to look for

Cheers

Angela

PS Thanks for replying!