PP CS4 - Sudden Jerky/choppy preview

Question

Hello,
I'm working on premiere for few months now, and everything worked fine.
The "common" folder started to fill up and got to 65GB, so I deleted it.
After that - every high quality/heavy video I put in premiere is jerky when playbacking it (without rendering, and obviously after I waited for premiere to confirm the file).
It wasn't like that before, it was smooth (when no heavy effects are on),
But now I cant watch most of the videos - I get about 1 frame per second, the playback is just unwatchable.
Please help, this is very urgent
Thank you

Answer 1

oh... its fixed ...whew...that was scary...I'm glad its Okay now.
what can cause this ??  well.... how many hours of free time do you have ??  The list is endless.
you didnt get the dreaded 'blue screen'... the dreaded blue screen is when you get NOTHING on screen...just blue color.
what you got was a message, and a very detailed one. It told you that your computer was having a hard time reading and writing to some portion of your hard drive ...maybe..
I say " maybe" cause often those warnings are not exactly accurate in terms of the real underlying problems..the actual "cause" of the problem.
if you check out your xp event logs and error messages and warnings etc you might be able to begin to pinpoint problems. that stuff is in my computer, manage , system tools, event viewer, and then there are 3 areas to check..usually system and application being the most relevant.
however, if its your hard drive you do need to deal with that, probably by getting another hard drive so you have more room , and then split stuff up...put program on c drive, project on D drive, resources on E drive, etc...
Then you also have to make sure your indexing service is off for all drives, and follow steps to maximize your computer for "editing" ( tons of messages here about that stuff in the hardware forum etc )... regarding your scratch disk sizes how to set all that up..
But basically, that screen you got is telling you that your computer is very close to being unhappy and not working anymore...even though you think it's fixed.  Stuff doesn't get better all by itself like magic...unfortunately.
good luck ! 
ps..when you post stuff, keep letting people know whats up cause otherwise we waste time answering stuff that is no longer a problem. Also, if this is now a problem that has been answered and so on, please mark it answered ...that way others dont waste time seeing if they can help out ...  we are just users like you and like to help one another... is fun !
good luck !