Hi Ali,
It can be a JAVA issue on the PC.
Check this link for JAVA compatibility for JAVA with the ASDM:
http://www.cisco.com/c/en/us/td/docs/security/asdm/7_5/release/notes/rn75.html#pgfId-164797
Also try to clear the JAVA cache on the PC and add ASDM IP in the exception list and test.
You can try reducing the security level in the JAVA settings as well.
Regards,
Aditya
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