You may get various DLL or OCX errors, run-time errors, and all sorts of weird stuff when you run some of the programs (the ones written in nasty VB6 for anyone who wants the details). One way to fix most of the errors you get is to install library files and the VB6 runtime files.
Download links:
Library Files:
(you need an account to see links)
vb6 Runtime:
(you need an account to see links)
*make sure to run these as administrator if possible*
64-bit users may also have to install to the SysWOW64 folder (some people I know had to, others haven't)