I was using my PC half way suddenly shut down, when i restart ,can see start up screen then shut down again, i try to reinstall window XP ,unfortunally system automatically shut down .
Can anyone help how to fix it?

See if you can F8 at start up to get into Safe Mode. If you can then it's a config problem. If not and it still does a quick shutdown even in safe mode then it could be a hardware problem. Use any type of boot disk, I like Hiren's. The key is boot into a partition manager and check the HDD for errors. If its hardware based it will shut down soon. If no shutdown reformat C Drive and try to do clean OS install. If it shutdowns then look at HDD, P/S, memory, motherboard. We had a cluster of 5 quick shutdowns last summer and it turned out to be P/S. Good luck.

we have had a run of these problems here all have been cpu cooling chek cpu fan is working and that cpu heatsink is in full contact it may of course be something else regards willjon