You are
exempt from FICA (Social Security and Medicare) taxes during the time period you are under the F-1 visa (including your OPT time) up to five calendar years.
If your employer is withholding FICA taxes, download IRS Pub 519 from
Internal Revenue Service, print off pages 46 - 51, and go to your payroll department with a request that they refund these improperly-withheld taxes, both for 2008 and 2009.
If they refuse to refund 2008 back taxes, be nice and request a refusal letter so you can apply for the refund using Form 843.
If you need professional help, email me at
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.