Scottrade account added an old security with the new update

unknown

I bought and downloaded Q2017 back in December and just installed it earlier this week, needing the downloadable transactions features back. Although I've been using Quicken Mac since the first version, this particular file dates back to around 2003, with some accounts a bit older. 

All of the accounts I monitor were in and working with the exception of Ameriprise (which seems to be an Ameriprise issue).

I installed 2 updates this week as well. About 6 hours after installing the most recent update, I noticed my net worth had increased by a large amount and it was due to the balance in my Scottrade account.

Back in 1996 I had bought 10 shares of CPQ (Compaq). HP bought Compaq. Apparently CPQ still exists but not under Compaq anymore and I no longer own it anyway. Quicken thinks I do, so it's recording 10 shares of the "new" CPQ at todays price. 

I need to know how to fix this without messing up my past history. I had always done downloaded transactions and quotes for that account to minimize mistakes.

I also sold some stock in early September, and it downloaded it as 2 separate transactions, one amount is what I ended up with as a check and the second transaction seems to be what I got as a check plus what went into the settlement account. So my cash balance is artificially inflated there too. I do not believe that was there before either.

I am not so invested in this version that I can't go back and do some experimenting with the old one again but I'd prefer to get this fixed correctly.

Thanks

unknown

Thanks, that's very helpful! I'll start playing with backups and see where that gets me. I appreciate your time!