|Likely either the malware and viruses, or their removal, disabled that. I found this:|
which just says to disable 'content advisor' in internet explorer. I think though, that's not going to fix yours.
It's going to be an IE problem so you may want to reinstall or upgrade your internet explorer.
I haven't tried it, but Tweak UI:
might be so some help. Even if it doesn't, installing it won't hurt.