At work, I upgraded my laptop by replacing the hard drive with an SSD. Boy, did it make a nice improvement in performance. I took the purist approach and did a fresh install of Windows 7 and reinstalled all my applications.
Imagine my chagrin after a careful rebuild, only to find a number of DLL files in the root of my C drive. I deleted them, only to find them returning regularly.
Doing some Googling on one of the DLL names (such as tsgetxu6ag55.dll) wasn't turning up good results. I'd find lots of results to web sites that 'identify files' and would give me a lot of nonsense answers not clearly telling me if it was spyware, a legitimate file, or any useful info.
I stumbled onto what was going on once I started Googling what the file was. The properties of the DLL made mention of Tom Sawyer. Once I Googled that, lo and behold the answer came to light.
https://thwack.solarwinds.com/thread/55808
One piece of software I had reinstalled was SolarWinds IP Address Tracker. The newer version apparently isn't well-written, and it dumps many files in the root of your C drive. Well, that's helpful (NOT).
At that point, I searched and found an older version of the install and downloaded that. No more pesky DLLs appearing in the root of my C drive.