Can't open NIS 2012, cceraser.dll error

I can't open my NIS 2012 at all, I've tried clicking the icon and the program but nothing appears. This occurs right after Live Update and uninstalling a McAfee antivirus which comes with the laptop (dont know if this has anything to do with the problem).

Also, this error message pops up every now and then:

 

RunDLL

There was a problem starting c:\programdata\norton\{0c55c096-of1d-4f28-aaa2-85ef5911266e7}\nis_1.9.7.0.9\definitions\virusdefs\20120518.048\cceraser.dll

Access is denied.

 

I've tried reinstalling and rebooting it several times (NIS Explore button wouldn't work right after reinstall), updated the virus definitions, ran a diskcheck and used Norton Power Removal but nothing seems to work.

 

In case you're wondering, im on Windows 7 Ultimate 64-bit, VAIO F-series VPCF127HG. Please help!