How did you
copy the files loaded right after the purchase
The file you are looking for is sol.exe and it should be in C:\Windows\system32 and C:\Windows\system32\dllcache (because it's one of the files monitored by Windows File Protection).
If you have a C:\i386 folder, you can expand sol.exe from C:\i386\sol.ex_ using the EXPAND command in a command prompt window.
That is,
(Start > Run > cmd > OK)
expand C:\i386\sol.ex_ c:\windows\system32\dllcache\sol.exe
expand C:\i386\sol.ex_ c:\windows\system32\sol.exe