It depends on your motherboard! Every motherboard has a limit, so you have to contact the motherboard or computer manufacturer. They'll tell you the maximum amount of RAM allotted for that particular device.
Generally, the limit is 120 days from the time of purchase. This timeline can be extended under certain circumstances -- read the terms and conditions.
Not under normal circumstances. When your computer boots, enter BIOS and make sure that your Windows drive is set first in the boot chain. Sometimes installing a new drive can...
No, but there is to being eligible to get a tax number. That age depends on your country, and sometimes you need attain a certificate for business management, too. Maybe...