Unexpected shutdown w/NAV2011

Hi there

 

Regularly i suffer from unexpected shutdown on my HP ProBook 6445b witn NAV 2011

but now I suffer a Autorepair sequence from Win PRO 7

after all the time I receive a report that points to

 

D:\windows\system32\drivers\nav\1206000.old\symds.sys is damaged

 

what the heck is that?

 

 and do not talk to me of previous version of NAV because this is its first time on this computer

 

I have always been faithfull to NAV but this is the n+1 computer i use with NAV

 

I appreciate any comments

 

 

 

[edit: Clarified subject.]