Can you try to make a new folder and add this -datadir=C:\BitcoinData under properties>start in. The BitcoinData is your new folder.
here's the sample below.
"C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=c:\BitcoinData
After that reopen the bitcoin qt again to generate new files inside the new folder.
If still doesn't work better to check the debug.log and let's check why you get this error.