Well, BE CAREFUL when downloading, installing, uninstalling sth from the web, coz:
1. some ad-based installation/ drive-by d/l could contain item you just do not want to use/ keep.
2. some express uninstall would delete some SHARED item during its configuration process.
As for security, I kindly recommend that you:
1). Perform a virus scan regularly under Safe Mode using an up-to-date security software. Here, I'd recommend avast to U.
2). Clean potentially unwanted programs (aka, PUPs). Check out "Uninstall a program" >> force remove any other unwanted/ unknown items in the list via an uninstall tool pro if Windows' uninstall utility does not help too much.
3) . To avoid foistware and malware infection, DO scan your download via the recommended avast or Virstotal from Google. Be cautious when you run ad-based installer like some freeware even downware.
Read real review, feedback before you put 3rd-party software to your puter; you had better first test such project on a test PC.
At this state, you can lessen potentially unnecessary changes/ modifications to your OS > you have less chances to encounter those registry-related problems.
Thx 'n take care!