I have a problem with Alexa Adware, that is reoccuring. It comes back everytime I restore my computer.

This Adware component, can be detected with both adaware Se, and Spybot Search and Destroy.

I have an emachines W2925 PC, That came with a restore DVD, in event of system failure, I'd be able to restore my operating system back to the way it was when it left the factory.

I've tried everything, to get rid of this adware Alexa. I've deleted, and wiped out my entire windows partition, Deleted the entire registry, Scanned with spybot search and Destroy and Adaware to remove it, and Then restored my OS With my emachines restore DVD.

Albeit my best attempt to rid my system of this, it has returned once again after I restored my OS, installed Adaware, and Spybot, Then run a system scan.

Can anyone tell me why this keeps returning, even after I've wiped out my entire windows partition, Scanned and removed the Adware, Deleted my entire Registry, and have done a system restore?

Thanks if you can let me know, and may tell me how I can get this off my system for good, Thank You