The error is embedded in the original signal. There's nothing that software can do, as it's a hardware limitation.
A TBC would be required:
http://www.digitalfaq.com/forum/vide...time-base.html
At best, there are some super-crappy "copy protection remover" devices out there, but those are expensive given the quality. Most of them are a poor man's TBC, and perform terribly. Your videos will almost always be left with distortions of some kind. Brightening and dimming (or outright over-brightness) is a common side effect of the cheap wanna-be TBCs.
Ideally, get a TBC.
If these are VHS tapes that were already commercially released to DVD, then just buy the DVD. Save yourself the hassle. For the $200 you'd spend on a TBC (or even $100+ on a crappy non non-TBC "copy remover"), you could have just as easily bought new or used copies of everything from
Amazon.com. That's assuming you even want copies of the VHS tapes anymore -- How many times do you really want to watch your favorites from 10-20 years ago?
