i had installed this powerfull tool combofix.exe and it solved my problem..
now when i tried to delete it...i found that it was being used by some other program..
after searching a bit ...i found a way to uninstall it by typing combofix /uninstall
which gave me a screen of combofox being uninstalled..but still the icon of combox was there on my desktop.
now what i here did was out of no knowledge...i removed everything which combofix did for me..
like firstly i removed the boot which it made for me that is recovery console...then i removed all files which were made on my c: manually.
next i searched the taskmanager if really there was any task running related to combofix ...n unfortunately there wasn't any...
now i thought that restarting the system will solve my prob...so i restarted the system..
and then again tried to delete the combofox.exe file but i again wasn't able to the same error popped up that it is being used by some other programme.
next what i did was checked if actually there were any programmes being started when i booted my pc.
by going in msconfig
and there weren't any just the normal ones..
now after trying everything i hope i get a solution here..or atleast a reason of why is this happening.
i am using windows xp sp3 .