Might be better served in the "VirusScan Other" forum.
VirusScan Enterprise is a Windows product.
Is the High CPU usage happening always or in specific scenario/specific time?
It could be a DAT update during which the scanners are initialized again or it could some IO intensive task happening which is resulting in scanners working over-time.
By default you would see 3 VShieldScanner processes which serve the OAS functionality.
Additional Scanner processes can be seen for each ODS task.
You dont have to re-install the product in order to resolve this kind of issue.
Enabling the product debug logging (KB70802) would help in finding out what could be going on at that moment.
Check the EPO server and make sure you don't have overlaping polices, Our ISO did this to me accidentially.