How do I get rid of Bargain Buddy.exe?

I am running Win XP.  I have discovered that a program called Bargain Buddy has installed itself in my Program Files.  I tried uninstall, but it didn't work.  I tried deleting the files, and some of them were deleted, all that is left now is the exe. file.  It won't delete because it says some other person or program is using it, to close those programs first.  How do I know which other program is using this?  I closed it in the Task Manager, but this didn't help either.  Everytime I log onto the Internet, it tries to update itself, and slows my work way down. (I do web updates for several clients).  I have another unknown program also installed in the last couple days in my program files called "blahmeta", the exe program is called "Camp64".  I also tried to uninstall/delete this with the same results as with Bargain Buddy.  I'd appreciate the help.