Sometimes Windows make it impossible to do elevated level configurations under Standard User account, no matter how hard one tries: runas doesn't work, right-click runas admin doesn't work, etc.
Changing a network adapter's advanced properties maybe one of them, but it's on regedit:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E97D-E325-11CE-BFC1-08002BE10318}
one of the keys listed under this tree is a network card in question.
I've used it to change "preferred band:" 5Ghz, under the key: RoamingPreferredBandType (0 = no preference, 1 = 2.4ghz, 2 = 5ghz) in Regedit. Though this does not force 5Ghz over 2.4Ghz.