Thanks David. You always provide the most lucid answers..
One thing.. if i fiddle around with a possible false positive file, eg. in removing it from vault, posting it on the site you mentioned etc.; is there any chance of it causing infection or is it that only clicking on a file can lead to infection?
If you could help me with a related matter, i have set autorun disabled on all my removable drives. I have to use my pendrive on a known infected computer at office, and i use it to carry material from my home comp to office. What i do is to format it always before opening on my home comp. So far it works, but is there a theoretical chance of getting virus by merely inserting the pendrive? (The obvious disadvtg in my method is that the pendrive can only be used oneway, it cant be used to carry material from other comps to mine)