maybe a boot.ini problem? this happened to me acouple times (installed a new burner, dusting off the mobo, etc..) use the xp disk, go to the recovery console, then bootcfg /scan it to find the windows install...hopefully it finds it...then use /rebuild to set that as the active partition
got the info from tekkenzaibatsu... about devil jin hovering around shooting lasers...that can be easily sidestep and has a free backturned grab/juggle.... D-pad MOD on PSP