Need to know what 3rd applications e.g AV, etc.. hardware e.g. Memory you have installed on this server, plus the model of server as well.
While the CPU is spiking could you please go to task manager and check to see which process PID is causing the CPU usuage it may be java.exe or inetinfo.exe process/service, but please have a check.
Please try uninstall CAR/ART then monitor if all is fine please try installing CAR again.
Have a look at the following DDTS.
* CSCeb54778 CDR Analysis and Reporting (CAR) menu option not showing up
* CSCea55522 art_log.ldf file grows very large, CAR records may stop purging
* CSCdx22199 High CPU from java.exe after reboot
* CSCdx48882 Manual purge of CDR data spikes the CPU to 100%
* CSCdy60211 High CPU issues when running reports in ART
* CSCeb43209 High CPU usage by Java when Cisco Telephony Integration Enabled Users report is opened
* CSCea06051 stiBackup does not purge files after backup
* CSCed51086 CAR report taking high CPU on the Active Directory (AD)
Cheers!
Yavuz