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Yep, been there done that just recently.
Here's an extract from another forum by me, as to what was going on.
"For the last 3 weeks I've been having real dramas with my laptop. The symptoms were: Similar to running out of RAM. Massive lag, not only on the net but just getting around in the computer generally. I thought I had a trojan running somewhere but buggered If I could find it! Tried changing the page file size, tried uninstalling certain things I was suspicious of. Nothing helped. Also thought I was going to have to reformat as a last resort.
So tonight I decide to get windows task manager running to determine exactly what the hell was going on, & went through my normal routine. I watched as the performance (CPU usage) go from its usual 4% right up to 100% in less than 10 mins. I then shut a few background processes down that were running - no dice. The only application that was running was my yahoo messenger...I figured it couldn't possibly be that, as I've been using the same version for nearly 6 years. I shut it down as a test & BINGO! The usage went back to 4%...."
The hint for you here is check your task manager to see what's up.
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