I've been having problems for the last two days now, where I cannot start windows xp on my laptop. It happened when windows required a restart atfer an automatic update on the 11th feb 2011, and I got a blue screen saying Unmountable boot volume as soon as i selected XP (on a dual boot computer). After burning a CD with the xp recovery console (as an ISO image) onto a disk and running it i performed the CHKDSK /R utility which didnt change anything and then FIXBOOT. After starting it back up it started to boot XP and got beyond the logo but then crashed again giving a different BSOD saying "fatal system error" (the error code has a 21a on the end).
I'm pretty much stuck at that, i cant start windows at all, safe mode or last known good config, giving the same problem.
I can however start up UBUNTU which i also have installed (via WUBI) which is what im using now, if that helps at all.
Any help would be much appreciated