Everything was working just fine until today. When I powered the netbook on it showed the usual white Acer logo and then I got an error message "Bootmgr is missing". When I tried to change the booting device there was no other choice than the one which was failing. I tried to fix something with the eRecovery management and restoring it to factory defaults, but it only goes up to 22% - after that it stops and displays an error:
Error code 0x241
(WIMApplyImage cannot apply image: Windows cannot verify the digital signature for this file. A recent hardware or software changed might have installed a file that is signed incorrectly or damaged, (...) (the rest of the text doesn't fit in the window)
is there anything I can do? Warranty ended almost a year ago.