I believe you can put the wallet software anywhere you like during installation.
But I think you mean how do you change the blockchain folder?

First of all, the blockchain folder for Pascal Coin is not like all other coins. My folder is only 900MB. So doesn't take much space. Read whitepaper...

But to move it, is a command line "magic" :p BACKUP YOUR KEYS FIRST! I take no responsibilites!
I have moved it myself, I hate having cryptocoins in the hidden appdata, just to be sure my wallets aren't gone if I reformat (yes I do have backups as well).

Find the 'PascalCoin' folder in C:\Users\<username>\AppData\Roaming\
Move this where you like it stored, for this example, lets use D:\BLOCKCHAINS\, so you would have D:\BLOCKCHAINS\PascalCoin

Then, open a command prompt as administrator and type:

mklinkD C:\Users\<username>\AppData\Roaming\PascalCoin D:\BLOCKCHAINS\PascalCoin

Replace <username> with your username of course.. so the paths are correct. Now any app looking for the content of C:\Users\<username>\AppData\Roaming\PascalCoin will think it's there, but it's just a symlink to D:\BLOCKCHAINS\PascalCoin