Laptop - MORE problems!

Used it last night - worked fine. Shut it down about midnight, went to bed.

Just turned it on - refused to go past the WELCOME screen. Rebooted. Same problem, and again. Booted into safe mode, did a system restore, boots up now, but is sluggish as hell, takes ages to do anything and normally it takes all of 10-20secs to log onto my wireless network, but now it just sits there saying AQUIRING NETWORK ADDRESS and does nothing

WTF? How can something go wrong overnight when it's turned off?