Network Adapters

Hi,
I have a problem I am on a plan with DODO internet and 2 days ago my internet was working properly and I tried to log in and it wouldnt let me so I rang dodo and they tell me that my network adapter is corrupt and i need to take my pc in to get fixed after about 2 hours on the phone to them. I have since restored my PC back to a previous date and it connects perfectly then but leave it one day and it is back to not connecting. I have restored it back to a previous date a umber of times now and every time it works but then I turn my pv off and when I log in again it wont connect. Obviously Dodo do not want to help me and I dont see how my network adapter is corrupt if I retore to a previous date it works.
I went on line trying to down load the driver they told me to get and I have had all sorts of problems. They......DODO told me to download 3 come ethernet link xl10 100 and see if that fixes it but I have had no luck doing this. Can some one please advise me what to do.
Cheers
Deb