They are most probably a reputable software company, personally having looked at the programs available, I would not download and use any. Programs such as these sometime cause more problems than they fix.

What is Solvusoft?

Solvusoft Corporation, a leading producer of award-winning utility software, is a US-based software company serving millions of customers in 150+ countries worldwide. ... This results in a drive and ability to continually improve our products and provide the best quality consumer software on the market.

Is WinThruster a virus?

As per the information we have the WinThruster.exe is not a Virus or Malware. But a good file might be infected with malware or virus to disguise itself.