God, the performance on your VPS must be atrocious.
So someone got a server. Then installed XenServer or something. On top of that, they created a whole bunch of VPSes, one of which was sold to you. Then you took that VPS, running Windows of all virtualising software. You then ran HyperViz on top of that. Then you installed more Windows VPSes, and you sold them on.
Besides being totally unstable, the performance on your VPSs must be quite awful. Good luck when the whole setup starts wobbling, and you have a bunch of irate customers demanding refunds.
@OP, unfortunately it is because of operations like yours that nobody has faith in small hosting firms.
On a more positive note though, learn some Sys Admin skills, and get your own dedicated machine. It will be more stable, faster, and more profitable than the setup you have now.
Just yesterday, I got a 16Gb, i7 2600 (quad core with Xeon like benchmarks), with XenServer, for just 50 euros (1st mth, 100 euros after), on a 100Mbs pipe, with unlimited traffic.