|You didn't list any info about your system. Maybe it's a just old & slow? Do you have a decent video card & at least 1GB RAM? Is Windows tweaked for best performance? Do you have a lot of crap installed & loading at startup or do you run a lean machine? Are you running a lightweight anti-virus program or a bloated hog such as Norton or McAfee? Are you running IE8?|
Anyhow, there's no secret to installing flash. Just go to the Adobe site & download it.