My INSN wallet is stuck and won't synchronize anymore
I just have to save the wallet.dat, delete all other files, reinstall again and put the old wallet file in? Never did this before, so I am afraid to lose my INSN
Weird. Are you using the latest wallet 1.0.3.2?
Deleting all files in the blockchain directory except wallet.dat is fine. That the only file you need to keep if you want to try re-donwload the blockchain. It won't take very long.
Side note for all: make sure you have a backup of ALL your WALLET.DAT files in a safe location! A computer can be stolen, an hard disk can crash, a random ransomware can encrypt your disk... shall I continue???