Bitcoin-Qt no longer working on my computer

[JustJake]

Ever since I upgraded to 0.8.1 (currently the latest) I have not been able to run the app.  I have gotten everything from database corruption errors to messages saying either me or my peers need to upgrade to claims of wallet corruption to errors saying Bitcoin-QT needs to stop without any other messages.  The debug log is not much help.  I have cleaned out the Appdata bitcoin directory (Windows 7) so that it can start from scratch and it always reaches some error 100k or so blocks in.  It is never the same place.

Any tips on getting the Bitcoin-Qt client to work again?  Is there some setting I need to try in bitcoin.conf?

[JustJake]

As an update, in the debug.log when it complains about a database corruption I am getting a lot of this:
ERROR: ProcessBlock() : already have block 187258 0000000000000735aaf7e4de10cf454f04442d1e5a86cddc091ba859d9d9c3a8
Misbehaving: XXX.XX.XXX.XX:14136 (0 -> 0)  // X's are numbers in the IP


And it finally errors out like this:

Committing 40490 changed transactions to coin database...
SetBestChain: new best=00000000000004e1baaff1b6c1430baf74a218d75227dc94d5ba1cf8feb5cf3a  height=188036  work=380091309209972119197  tx=4766050  date=2012-07-08 00:48:20
SetBestChain: new best=0000000000000919b1658c09ddd7af8af1218c1221f159aae690371ed908e842  height=188037  work=380098831764706914198  tx=4766255  date=2012-07-08 00:51:17
SetBestChain: new best=00000000000003be2289dba3c533a541dcb4562ec23716d56603e2a35e7dffc7  height=188038  work=380106354319441709199  tx=4766266  date=2012-07-08 00:54:53
SetBestChain: new best=0000000000000085a65e20a0a91adafde994c279cef42b2106d3d56ae7f406b0  height=188039  work=380113876874176504200  tx=4766584  date=2012-07-08 01:10:17
SetBestChain: new best=0000000000000585d4af1ab38da9d1679b03325e86b6524cb920342c50f479d5  height=188040  work=380121399428911299201  tx=4766590  date=2012-07-08 01:26:24
SetBestChain: new best=0000000000000006b58950e297614ab1b0f1f43f752b85fbd19fe0859776ca78  height=188041  work=380128921983646094202  tx=4766865  date=2012-07-08 01:26:10
SetBestChain: new best=00000000000008661c6208e374d0551c08b7c33e75206ea78b5e6d628b9b1769  height=188042  work=380136444538380889203  tx=4766985  date=2012-07-08 01:40:23
SetBestChain: new best=000000000000080d6faa549e70107002bd800462082b4a57bf41d2ed4a48ecf3  height=188043  work=380143967093115684204  tx=4767238  date=2012-07-08 01:43:52
SetBestChain: new best=00000000000007aed8a162c27163dd3a0343ed3e9a027280e4c848178787f2e0  height=188044  work=380151489647850479205  tx=4767246  date=2012-07-08 01:44:50
SetBestChain: new best=00000000000007726f45fa442aec9a095f8aef41bd32df8d4732cefbe5059fa9  height=188045  work=380159012202585274206  tx=4767280  date=2012-07-08 01:52:58
LevelDB read failure: Corruption: block checksum mismatch
*** System error: Database corrupted
socket recv flood control disconnect (5003435 bytes)
disconnecting node XX.XX.XX.XX:49228
Flushed 13782 addresses to peers.dat  51ms
socket recv flood control disconnect (5003362 bytes)

[maxmint]

I'm having similiar issues, but I'm on a Mac. I posted about this here: https://bitcointalk.org/index.php?topic=155140.0
It started with different errors, I let the client rebuild the database, it crashed and since then I only get "Database corrupted" system errors.

[mobile4ever]

Have either of you gotten your problems fixed?

[maxmint]

Have either of you gotten your problems fixed?

I ended up re-download the blockchain. Now everything is working again, but I still don't know what could have been the reason for the errors.

[mobile4ever]

Have either of you gotten your problems fixed?

I ended up re-download the blockchain. Now everything is working again, but I still don't know what could have been the reason for the errors.

I ended up doing the same thing. Those of us who are not programmers or super-confident in our file-wrangling need some help.