um do the usual stuff

- use ccleaner to clean ur pc
- delete TEMP files (I think ccleaner doesnt do that)
- get fresh flash https://www.adobe.com/products/flash...ribution3.html
- try with different browser
- turn off security stuff (Firewall etc..)
- scan pc, check for virus, trojans, malware, and spyware
- maybe something is using ur internet (torrent,windows update..), turn them off
- disable everything from startup (everything seriously!)
- try game in safe mode?
- check task manager when problem occurs, if it's another program could be 1st or 2nd by memory / CPU usage
- is that windows x32 or x64?