try turning the PC off form the internet, then turn off antivirus/antispam software.
that's one possible cause.

ANother more important thing to check and much easier is this as I KEEP TELLING FOLK:

very often issues seem to be graphic card related, so try these settings above in your Options in Vue! :)
 

if that doesn't help try turning off DRAW BACKGROUND THREAD, if that doens't help turn on Wireframe. If you turn TEXTURES off in that menu it uses much less resources by the way.

My suspicion is it's grpahics card/driver related plus osme other conflicts. Ndivia game cards seem fine, by th emajority, some of the Pro cards (qudro) seem to have issues. The ATI cards have even more issues, and MACs have a lot more still.
:)
 

 

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