I think the path is actually:
In neither mine or a customers Windows 7 x64 C:\programdata did we have a Wlanvsc file/folder directly, it was within the Microsoft folder.
Adding Local Service, the user name (Administrators group already had full rights) and then rebooting the laptop for good measure has not cured the problem for our customer unfortunately.
When coming out of sleep his laptop still needs to be told to connect to the wireless for it to work, otherwise it will automatically try for 45 minutes before failing.
We have changed drivers, replaced the wifi card and recreated the wireless profile in Windows. Dell now say to reinstall which we are loathed to do.
Thanks for your suggestion though.