If the windshield was installed by someone who knows what they're doing it will not leak.
The cost of a power steering leak repair depends on the leak placement and the car. A filler cap replacement might be 5.00, while a leak causing a steering rack replacement could be 750.00 or more.
possibly a weld if leak is accessable and repair cheaper than replacement where leak occurred
Gas tank leak repair at Canadian tire or replace it,replacement is the best choice if you're keeping the car.
Bad seal - needs replacement
No not always.
I would think one that holds gasoline and doesn't leak would be a proper replacement.
Replace it with an oem replacement line.
Installed incorrectly, or cheap/faulty faucet
Cost of a crank seal leak repair
The seals on your windows have a leak or in need of replacement.
It depends on the location of the leak. Commonly the feed hoses from the reservoir to the power steering pump will leak, the fix is to just replace the clamps.
I had the same problem with my 1992 Accord. Replacement of the trunk lid gasket fixed the leak, but I had to special order the gasket from a dealer.