Moved to Malware Discussions > Home User Assistance for better attention.
I trust you mean the online Windows Live OnceCare scan? Having 2 antivirus applications installed can cause problems.
This is a detection indicating that you may need to update Java - http://www.java.com/en/
Try a scan with an independent anti-malware application such as the FREE version of THIS tool.
Update it before running and let it remove anything it finds and reboot if asked to at the end.
It's a useful tool to keep around as long as it's kept updated as antivirus applications don't always catch everything, I hate to admit.
Also keep Windows totally up to date at all times.