Looking through the rest of the text for other instances:
Now, for each line, I'll go word by word, check if the word is a proper noun. If not, replace it with three synonyms. If it is a proper noun, leave it as is but in spintax. Wait, the user says to "skip proper nouns". So proper nouns are not to be spinted. So the correct approach is to skip proper nouns when applying the synonyms. So for example, "Sony" is a proper noun, so left as is. But "Windows 7 (64-bit)" is a product name and an OS, so "Windows 7" is a proper noun, so "7" and "64-bit" are part of the name. Therefore, they should be skipped. However, in the system requirements, "Windows 7 (64-bit) or later" – here, "Windows 7" is a proper noun, so that's skipped. The "64-bit" is part of the product name (Windows 7 64-bit), so it's a proper noun. Therefore, "Windows 7 (64-bit)" is considered a proper noun and should be skipped. Similarly, "Intel Core i5" is a proper noun (brand and product). Therefore, the parts inside those should be left as is, but the rest can be replaced. sony vegas pro 12 build 770 -64 bit-
Same with "Hard Drive Space: 500 MB or more" – "Hard Drive Space" becomes "Storage Capacity|Disk Space|Hard Disk Space". Looking through the rest of the text for