Source: Microsoft Cinemania 97. Not every movie in this suggest list belongs to sf genre.
In alphabetical order:

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Hi-Tech Movies

• Android (1982)
• Blade Runner (1982)
• Colossus: The Forbin Project (1969)
• The Computer Wore Tennis Shoes (1970)
• D.A.R.Y.L. (1985)
• Dark Star (1974)
• The Day the Earth Stood Still (1951)
• Demon Seed (1977)
• Forbidden Planet (1956)
• Kronos (1957)
• The Lawnmower Man (1992)
• Making Mr. Right (1987)
• Metropolis (1926)
• Robocop (1987)
• Short Circuit (1986)
• Silent Running (1971)
• Sneakers (1992)
• Star Wars (1977)
• The Terminal Man (1974)
• THX-1138 (1971)
• Tron (1982)
• Wargames (1983)
• Westworld (1973)

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Science Fiction Classics

• 2001: A Space Odyssey (1968)
• Alien (1979)
• Close Encounters of the Third Kind (1977)
• The Day the Earth Stood Still (1951)
• Destination Moon (1950)
• Earth vs The Flying Saurcers (1956)
• Fantastic Voyage (1966)
• The Incredible Shrinking Man (1957)
• Invaders from Mars (1953)
• It Came from Outer Space (1953)
• The Man Who Fell to Earth (1976)
• Metropolis (1926)
• Mysterious Island (1961)
• Planet of the Apes (1968)
• Red Planet Mars (1952)
• Silent Running (1971)
• Solaris (1971)
• Star Wars (1977)
• Tarantula (1955)
• Them! (1954)
• The Thing (1951)
• Things to Come (1936)
• This Island Earth (1954)
• The Time Machine (1960)

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Space Invaders

• The Blob (1958)
• The Brother from Another Planet (1984)
• Close Encounters of the Third Kind (1977)
• Cocoon (1985)
• Communion (1989)
• The Day the Earth Stood Still (1951)
• Earth Girls Are Easy (1989)
• Earth vs The Flying Saurcers (1956)
• Fire in the Sky (1993)
• The Hidden (1987)
• I Married a Monster from Outer Space (1958)
• Invaders from Mars (1953)
• Invaders from Mars (1986)
• Invasion of the Bee Girls (1973)
• Invasion of the Body Snatchers (1956)
• It Came from Outer Space (1953)
• Killer Klowns from Outer Space (1988)
• Lifeforce (1985)
• Morons from Outer Space (1985)
• Predator (1987)
• Starman (1984)
• Strange Invaders (1983)
• The Thing (1951)
• Visit to a Small Planet (1960)
• War of the Worlds (1953)

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Special Effects Wizardry

• 20000 Leagues Under The Sea (1954)
• 2001: A Space Odyssey (1968)
• The 7th Voyage of Sinbad (1958)
• The Abyss (1989)
• Back to the Future (1985)
• Blade Runner (1982)
• Close Encounters of the Third Kind (1977)
• Darby O'Gill and the Little People (1959)
• Death Becomes Her (1992)
• Destination Moon (1950)
• Forbidden Planet (1956)
• Jason and the Argonauts (1963)
• Jurassic Park (1993)
• King Kong (1933)
• Metropolis (1926)
• Return of the Jedi (1983)
• The Ten Commandments (1956)
• Terminator 2: Judgment Day (1991)
• The Thief of Bagdad (1940)
• Things to Come (1936)
• Tron (1982)
• War of the Worlds (1953)
• Who Framed Roger Rabbit? (1988)
• The Wizard of Speed and Time (1988)