I thought I deleted downloaded BlackBerry software, but it remained even after I did a system restore. I manually deleted it from the Apps folder, but it's still in System Profiler under Apps. How do I delete this from System Profiler?

Right now, it seems as if it is still showing in System Profiler, then the unnecessary BlackBerry software I downloaded from the internet is still using memory, right? How do I permanently delete it?

In addition to what Drew wrote, remember the Mac has a data fork and a resource fork.
Here is an old thread but a nice recap by Dr. Smoke
._Files
Note that the ._file files you note are the resource forks of Mac files you copied to the drive from your Mac, and these are only visible when you use the Flash drive on a PC. These are normal and indicate the Flash drive is already formatted for Windows.
When you copy or save a file from a Mac OS X system to a Windows shared volume or a Windows-formatted disk, the Mac creates two files: the data fork (xxx) and the resource fork (._xxx). This is called Apple Double Format and is normal. The resource fork contains additional data about the file that is exclusive to the Mac that cannot be saved otherwise on Windows-formatted disks. This is new with Mac OS X, as documented in Mac OS X: Apple Double Format Creates File Name With the Prefix '._'.
The resource fork files (._xxx) are necessary if you want to copy the file back to the Mac and retain the metadata. The resource forks of files are invisible when they are used on the Mac: the Mac OS Extended file system (aka HFS Plus or HFS+) uses forked files, with a file having both data and resource forks.
You can delete the resource forks on the Windows disk if and only if you don't care about losing the resource fork information should you copy them back to the Mac, such as comments, image preview icon, etc. Some Mac applications use the resource fork data, so deleting the resource fork can be problematic if you copy the file back to the Mac. Likewise moving the file while not also moving its associated resource fork when using the data on a PC can result in problems when using some files again on the Mac.
You can't prevent the resource forks from being created if you copy or save files from the Mac to the Windows share or Windows-formatted disk via Finder.

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