I am please to say that after 2 hours monitoring last night as well , i no longer have my problem. I am happy to say that the clean rebuild has solved my problem.   Very many thanks for all of your assistance Dell-Rajesh R .
The full text from my event viewer is  "C:\Program Files\Dell\Dell Wireless WLAN Card\bcmwltry.exe". Dependent Assembly Microsoft.VC90.MFC,processorArchitecture="amd64",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.21022.8" could not be found   Appears to go back to 16/06/13 and appers every 7 - 10 secs.   Originally i have sought help via microsoft answer and with their encouragement believe i have updateed every available drive available on the DELL website., after reinstalling VC++2008 .   I am now turning my attention to my WLAN card itself. But may i ask if any one here has any experience of this fault or has seen it before. I am a bit concerned that it is not flagged up as an error by my notification centre.
Dell Wireless WLAN Card Error msg