at some windows 10 users, it may be that the "webchaind.exe" is recognize as a virus. but it isn't a virus that was already explained by albertod.

i had the problem: when i start the new wallet update it will be installed without any problems but if I start the wallet it wants to extract the new updated "webchaind.exe" and then it pops up a bug screen while trying to syncronize. something with java error has been showen. i think its because the "webchaind.exe" gets blocked by windows 10.
i checked the folder in user/appdata/local/webchainwallet and i realize that the "webchaind.exe" was missing in the folder. so it was automatically deleted by windows 10 without any information given.

if u have the same problems just make sure your anti-virus real-time scanner is turned off while installing the new "webchainwallet.exe" and after you installed, don't start the wallet directly, just make sure you add an exception rule for the executable "webchaind.exe" to your anti-virus tool! you can also add all ".exe files of webchain to have a safe mining success. but be sure u have the right files from webchain github.

after u added "webchaind.exe" as a non virus to your antivirus tool or windows defender, you can enable your anti-virus real-time scanner again and everything works fine. no worries and good luck by the way