Using internet security suite, full scan stops at 98% on a file called rootkit, quick scan stops at 99% same file rootkit.
Should I be concerned ? Using HP 110 Desktop, windows 8.1
It's a known issue that cause the can to stall for a long time when it's looking for rootkits. That does not mean it's found any, just that it is stalled. It will eventually complete the scan but if you wish to follow up on this you can obtain free phone or online chat support using the Technical Support shortcut under Useful Linkis at the top of this page.