make sure sonar is seeing the folders your vsts are in first and for most.
its in preferences.just make sure your folder with all your vsts are included on the vst scan list.
next think about this...are you sure they are vsts?
because if they are DXI plug ins then your going to have to start over and look for new plug ins.
theres a whole slew of them out there for free,good ones too.
sonar h7 with its multicore support/it also doesnt support DXI plug ins anymore. which alot of the older sonar homestudio/pro audio used to use.