Pls check the backup disk u made when u first started the computer u can restore the empowering technology files from that disk if u dont have the disk then
go to this link and download acer empowring tech from here
ftp://ftp.support.acer-euro.com/notebook/aspire_7720/vista/Applications/ if not solved then u can do below
u can system restore to earlier date everything will be ok if u are using vista go in start>all programs>accessories>system tools>sytem restore u can try to restore ur system to earlier date when everything was ok with no errors
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