I have synchronized 0.8 version on a less powerful PC just last month.  Just built this upgraded PC and downloaded 0.8.1.  PC has been running for days now and still will not sync. 

I have seen some posts about a manual import but those files are accompanied by warnings about "do not use if you already have a wallet."

I used all the same files (restored from backups) to initially use 0.8, prior to 0.8.1. 

Synchronization keeps jumping from 1900 block to 800 block, then back to 1900, crawls to 1800, then back to 800, then back to 1900.  This has been going on now for at least 24 hours.  CPU usage is very minimal, HDD usage is very minimal according to Performance Monitoring.

Please help.