Activation limit exceeded !!!! - What Gives?

[matsher]

Activation limit exceeded !!!!

Not sure how, I have only loaded it onto 1 pc...

Is this an UBI, STEAM or 1C activation system? Who must I write to get it fixed?
I wrote to STEAM yesterday and they haven't responded to me and I am well peeved. I am just not sure who to be peeved at - Aaaaargh!!!!!

The only possible explanation for this is in the last 3 days, to run COD, I have upgraded the CPU, the Motherboard BIOS and then the GPU...
I am not sure why or how it works with STEAM but there is NOTHING more frustrating than when your PC is finally beefed up and STEAM says
"sorry bud you're not allowed to run the sim you bought.

Can anyone shed some light on this?

Any advise me on how to avoid this in the future would be welcome. 'Cause if my pc still has issues running it,
I may want to upgrade Motherboard, ram and possibly swop my new GPU for a stronger one or run SLI.