newish Medion pc works ok after some initial problems with vista and older hardware. Returned from a month away to find 12 MS auto updates and installed them (can't remember what they were). Then started Mailwasher to get rid of junk in 650 emails but part way through everything disappeared to give a blueish screen with a small white oblong in top rh corner (latter hasn't appeared since). No response to anything so switched off with on button.
Tried to reboot which produced: Intel logo with inoperable options below followed by pc started to boot then a window 'Windows Error Recovery' screen came up with various options none of which could be accessed. After the usual 30 seconds to 'Start Normally' it went on to a 'Micro Soft Corporation' rolling symbol as though it was going to load but after about 10 seconds went blank to a bluish empty screen.
installed manufacturers Recovery Disc and restarted using main button. Same thing happened and I could hear cd whirring but it was obviously not recognised.