your drives are on raidide1 and raidide2 correct? and both are masters? hmm.. the raid formatting went ok? have you tried anything else like win98se or win2k?
another thing that could be it is that when you first begin setup of win2k it asks to install a third party raid driver, by pressing F6, if you dont do that then it could cause problems for the installation procedure for reading your raid setup correctly.. so I suggest watching out for when winme asks for this or try just installing win2k instead..
Abit KT7A-Raid, Duron 700 @ 900 (139fsb) SupaOrb Cooler, Kingmax 128mb, GeForce2 GTS, 2x 20gb Ibm 75gxp's (RAID 0) SBLive X-Gamer, Matronix 10/100 NIC, Whistler and Win2000