|From what I can make of it ARO2011 is an "Advanced Registry Cleaner". It is nothing near like MalwareBytes which checks for Viruses, Trojans and the like. MWB freebie is very well known and respected around these parts - it often finds what AV's miss.|
IObit seem to offer various programs so I don't know which one it was.
"HijackThis" is fine but it makes me wonder if what you downloaded was some spoof with a deliberately similar name. I'm afraid there are so many bogus anti-virus scams around that it must be hard to tell which are good or bad, unless you do this sort of thing a lot like the folk on here. Beware of anything that asks for money to fix what it purports to find - usually scams. There are good free programs around for most things, so always ask on here if you need anything.
I don't know what AV you are using but Windows Defender itself is not really one. It has been replaced by Microsoft Security Essentials (free), which IS an AV, and would be a much better bet unless you have some other good AV onboard. There are quite respectable free ones around, such as Avast.
If ARO2011 and IObit worked some magic then that is good to hear. In general though I would be very careful using such programs because they can have a knack of making things worse. CCleaner is a good and popular freebie which clears out general junk.
Anyhow, thanks for taking the trouble to let us know things are going better now.