The only way you can install AutoCADD or Adobe Acrobat on your new 'puter is to use the original install disks.
As far as using the same license on two computers, you'd have to check your site license level to see what permissions your company has.
You didn't specify if the PC is work or home. If work, you should go through your supervisor and IT departments, otherwise you might create legal issues for your company.
If the PC is for home use, CutePDF pro will do almost everything AdobeAcrobat will do. (Actually, so far I haven't found anything Acrobat can do that CutePDF Pro can't.)
As far as CADD, try
ProgeCADD. Enter "Progecad 2008 smart" in the search box to find the 2d "free for personal use" version. If you need 3d, check out the standard and professional versions. Yes, they're $250 AUD and up, but they're still way less than AutoCAD.
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I am not a computer professional, My advice comes from personal experience and/or friends who are computer professionals.
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