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Nods, forget Tend Micro, it doesn't protect you and costs too much. Avast and AVG are free. I use AVG and version 8 is working pretty well but none of them can guarantee 100% protection.
There is no upgrade or downgrade option to/from xp/vista. It's a wipe and reinstall job. You may have to change BIOS settings going from vista to xp as AHCI is hard drive option that xp will only understand with add on drivers where as Vista knows about it out of the box. Change AHCI to IDE in BIOS.
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