Don't think that's the problem, but even if it is, closing the process will only stop it until you reboot your computer. Go ahead and try it though. I've closed the process iexplorer.exe many times and never have had a problem. Try running these free virus/spyware fixers. (in order from what I think is best. All of them are good).
Malwarebytes (great scanner. Found 50 some Trojans on my pc and fixed them for free. There is a paid version but that only adds live protection and you don't really need that)
AdAware SE personal from lavasoft. (great home version of the program. It's free and does pretty much what spybot does but I think a bit better. Run both so you find all of it)
spybot search and destroy (very simple freeware program. Finds and fixes spyware and adware for free)
and then get one of the following antivirus programs.
Avast antivirus (the home version is free. It says 60 day trial but you just register an email and it gives you a license for a year. Just renew once the year runs out (still free))
or
AVG free edition. (free, no license code thing needed.)
I'm not sure which antivirus is better, just scan an fix with the first three. Then choose either avast or avg for live protection.
Good luck!