|... I always used my laptop through mains with battery removed or inserted because it was say a knackered one!|
... next time you manage to log into Windows go to "start" run and type:
CHKDSK C: /F [Press] OK
... it'll prompt you to type "y" so next time it starts up it'll check your harddrive and fix any errors!
... Posting is provided "AS IS" with no warranties