Keep getting Avast's "Malicious URL Blocked" messages every few seconds

I have Vista Home Premium, 32-bit, Service Pack 2.   For the last week or so, I keep getting Avast's message: "Malicious URL Blocked"  popping up every few seconds.  The 2 common ones are from 'hxxp://oldschoolzz.ocm/x/" and "hxxp://newgenerationp.com/x/" .  I have ran all Microsoft security scans, Malware Bytes, Avast, somethng called aswMBR, and hijack this.  I have also done a couple boot scans. I have ran logs of these and so far the Avast support tells me they can't find any virus/infection.  There have been times where I do scan and either Trojans or registry items come up.  I then delete them but right away when I reboot, I get these pop-upd back again.  I have also restored to a point before this happened, but that did not solve it either.  Sometimes it even comes up when I am not on the internet.  Any other suggestions besides reinstalling Vista :(.  Any other suggestions.  Please let me know if you need any other information.  Thanks for any help!