Blocked E-Mail keep Re-appearing

I mistakenly clicked on "Add Sender" to  Safe Senders list.to a piece of junk e-mail. I meant to add it to my blocked senders list. The message is from the following:

 

"Genuine Pfizer c Retailer [xxxxxxxx@telus.net]" (x's are mine) with a subject line of:

 

"*TELUS Detected Spam*Special 80% discount for customer xxxxxx on all Pfizer"

 

No matter how many times I've added this to my blocked list it keeps on coming back into my safe mail file. I fear that I have had a bug or virus planted in my computer. I have done the suggested "Turn off restore and scan" and nothing comes back as a problem.

 

Please help, my next step may be to clean off my hard disk. I'm running Internet protection 2010 and using Windows Vista.

 

Many thanks for the assistance.