This one is another learning for me....
I had a folder(Kyun Banaya tha mainey grrrrr) in my Lappy(Vista 64 Bit) named C# Tutorials and under that i had some great stuff in the form of *.chm files...To My surprise i was not able to view those files(I knw...I knw Unblock feature).....
So i removed those chm files to my c:\ drive directly and tried opening them and it worked ....after a two week of re-search and scratching....i found it was the # in the "c:\C# Tutorials" that was breaking the whole damm thing....
Anyway now its ok :)