hello,
Try to use Clean wipe tool for uninstall sep client.
You may need to contact Symantec Technical Support and create a case for Latest CleanWipe Tool.
Check these Steps below:
How to create a new case in MySymantec
http://www.symantec.com/business/support/index?page=content&id=TECH58873
Phone numbers to contact Tech Support:-
Regional Support Telephone Numbers:
- United States: https://support.broadcom.com (407-357-7600 from outside the United States)
- Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
- United Kingdom: +44 (0) 870 606 6000
Additional contact numbers: http://www.symantec.com/business/support/contact_t...
Check this thread with same discussion
https://www-secure.symantec.com/connect/forums/error-during-uninstall-sep-client