ROM

If I of more of my hard drive (ie installing FS9 in addition to FSX) will it slow down my comp?
1 gig RAM, 160gigs hard drive w/ 90 used
1 gig RAM, 160gigs hard drive w/ 90 used
Flight Simulator and other chat
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https://forums.simviation.com/phpBB3/viewtopic.php?f=9&t=25382