NPE and "Windows Custom Safety" -- how long should scan take?

Hello,

 

I'm running NPE on an Acer AspireOne A260 netbook running Window 7 that has malware on it called "Windows Custom Safety".  The netbook has an N450 processor and a 260GB hard drive that probably had 80GB on it.  It's successfully connected with the internet at the start when it needed to, and now it's just churning with a status of, "Scanning your computer: Processing scan results".  It's been at it for about 4 hours at this point.  Is this normal or is it just hung up?  There's no other status info in the application to indicate if it's not making progress.

 

Thanks,

wir