Go to wallet data directory and delete all files except wallet.dat (never delete wallet.dat), then start wallet for complete resync. If it doesn't work, I am out of ideas.

It's just the name of the wallet executable followed by -rescan.

Try -rescan or -reindex, faster fix than deleteting and redownloading. Database coreupts when wallet has unexpected shutdown. But the wallet crashes don't happen that often to me, maybe 5 times since the coin launch. To run commands i mentioned above, go to folder where wallet executable is located. Shift right click folder background and click open command or powershell here. In console window type name of wallet executable and - rescan or - reindex behind it. (make sure wallet is not running)

1 Era is min. but will take time.
The more you have the faster it will be.
To get one stake a day (=10 ERA) you should have approx. 4K.
To get one stake a week you should have approx. 500 ERA.

Guys, you don't need to sync from beginning...

Download chain-data file, unpack and insert in folder "C:\Users\<YOUR USERNAME>\AppData\Roaming\Denarius

https://gitlab.com/denarius/chaindata/blob/master/chaindata.zip
"Denarius chaindata at height 663325 (extracted at Fri Mar 23 12:02:46 UTC 2018)"

You will have synced wallet in few minutes

It shows out of sync because you still don't have latest block downloaded.
What is the latest block you have downloaded?
How many connections your wallet currently have?

You are using latest wallet but that doesn't mean that you are synced automatically .

For a start try to put the GPU in the primary slot on the motherboard. If the system does not see GPU it is necessary to check BIOS and driver. You also need to test that GPU on another computer. After that, you can check the performance of the riser. But this happens very rarely. Need more specifics to give you the right advice.

Have you tried to another gpu?
Can occur due lack of power on the power riser, try to change with different power riser like 6 pin/4 pin /sata or can be happened because of pciex1 or a cable on riser is broken.