So i want to install a ATI radeon HD5770 1GB GDDR5 PCT-E video card on my computer is it possible to do this?

COMP specs:
Operating System: Microsoft windows vista home premium
CPU: AMD Athlon 64 X2 dual core processor 5000+
Memory(RAM): 3.00 GB
Video card:ATI radeon 2100
Manufacturer:acer
Model:Aspire M1200
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