That sounds like you have some tracking cookies and the like, if so the ip address is irrelevant, the problem is your system has what would be considered to be an "infection" in the mildest of forms, this doesn't mean you need to panic, it may come under the infection umbrella in the loosest of ways, but it's not harmful, just annoying.
What I suggest is to update ALL protection, and run some scans, but not knowing what you have I can't say what would be most likely to work, but even if I did no single piece of software can catch everything, so multiple layers are best as they overlap, and each gets stuff the others may not, but there is a very important rule when it comes to protection, and thats the 1 at a time rule, basically when running a scan, or using real time protection of the same type as another product at the same time, so only run 1 firewall, 1 anti spyware and 1 anti virus at a time, you can have as many standalone scanners as you like, but only ever run 1 at a time, and disable real time protection of the same type before scanning with another standalone scanner.
So I will simply list some of the biggest names we all recommend, they are all free as standalone scanners, but if you buy them you can activate real time protection as well (but remember the 1 at a time rule), but you can use them for free without real time cover, it may look overkill, but you have nothing to worry about, but no matter what system I touch the following is the minimum I put on them, they offer protection and scanning\removal should it ever be needed, and it's a good habit to scan say 1 of these a week, so in a month you have run them all.
a-squared Free
Malwarebytes Anti-Malware
Spybot-S&D:- Note; The TeaTimer component of this is considered real time protection, most disable this part of the program, just look for the check boxes during the install and uncheck the TeaTimer component and you will be good to go.
SUPERAntiSpyware
Also listed are some junk file cleaners, they also clear out cookies, if you use cookies to avoid signing in each time let me know and I can tell you how to save the ones you want and just clear the junk, but again like the protection, each one gets bits the others miss.
CCleaner:- Note; Watch the options if you install the full version, you will need to remove the check marks in some of the options or you will add components you do not want like the Yahoo toolbar, so either use the
Slim version, or take notice of what each check box gives you and remove what you do not want.
Disk Cleaner
CleanUp:- Note; This does not work with Vista, at least there is no support for it so even though some say it's OK it's best to not use with anything but what they list.
See what happens after you use these, hopefully they will remove the cookies I suspect that are causing this issue for you, hope it helps.