You may just have corrupt system files which can be restored to factory settings. It's roughly a half day job, but usually your computer will run a whole lot better afterwards. Since it formats the hard drive before proceeding, you need to back up any data you want to keep, and of course you'll need to reinstall any software you've added since it was new. It's a pain but it sure beats having the problems you describe.
This netbook has been to the Middle East, Papua New Guinea and Tahiti and all points in between over the last two years. It now locks up shortly after it is turned on. I managed to get a system restore in before it locked up again. I restored it to Nov 7th, the last day it was working properly and at home in Canada.
The system will lock, freezing the screen and the cursor. I am unable to turn the netbook off, including a hard shutdown. I have to remove and replace the battery. When the netbook boots up I get the old start normally screen but am now starting it in safe mode. Then it will lock up again, not at the same screen or time in every case. There seems to be a bit of heat from the vents and I am wondering if all the changes in climate may have affected it?