Access Data Base set up

There is 3 data bases here

the 1st one - called customer has the following problems

1)the add customers does not work
2) edit customers does not appear to work
3) the import & export does not work


the 2nd one - called postage app has the following problems :

1) the add order does not work
2 the search does not work
3) edit & export does not work

these are the 2 we need to get working asap

How much / long would it take to get these working & setup on my PC

These were created by someone on here who has since closed there account down and run off with the funds