i have same problem later and im using eeePC 4g surf LINUX... and now, can watch movies again.. this is what ive done..
open your synaptic package manager then click on the "installed" on the left panel.
then, try to find 'adobe-flash-payer' and RIGHT click it to "MARK FOR REMOVAL".
when your done, try to look to left panel again and click 'NOT INSTALLED'.
after that, look to the right panel again and search for 'ADOBE-FLASH-PLAYER' and double click it and choose 'FOR INSTALLATION'.
when your done, restart your system or browser then look for some videos if you can watch already... if not, just format your eeePC to factory settings... just save your 'dont want to delete files' before doing that.. or if you dont want to do that, just ask professional linux techs for a real help..