They are aware of this and first of all when it says Scanning: Rootkit, it means it is scanning for rootkits, not that it's found any.
Secondly they are also aware of the hanging at 98/99% issue. It does clear eventually but takes a long time especially on some machines.
If it (I mean the hanging part) really worries you try contacting Technical Support, it's free of charge by phon e or online chat and linked under Useful Links at the top of this page
Thank you for everything.