For the current week, the overall ratings of four Software stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Taomee Holdings’ (NYSE:TAOM) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Taomee Holdings produces children’s entertainment. In Portfolio Grader’s specific subcategories of Earnings Surprise and Margin Growth, TAOM also gets F’s. For more information, get Portfolio Grader’s complete analysis of TAOM stock.

SRS Labs (NASDAQ:SRSL) earns a D this week, falling from last week’s grade of C. SRS Labs develops and licenses audio and voice enhancement technologies. The stock gets F’s in Earnings Growth and Margin Growth. To get an in-depth look at SRSL, get Portfolio Grader’s complete analysis of SRSL stock.

The rating of TeleNav Inc. (NASDAQ:TNAV) slips from C to a D. TeleNav provides location-based solutions. The stock gets F’s in Earnings Growth, Earnings Momentum, and Margin Growth. The stock price has fallen 12% over the past month, worse than the Nasdaq, which has held flat over the same period of time. For a full analysis of TNAV stock, visit Portfolio Grader.

This week, Red Hat (NYSE:RHT) drops from C to a D rating. Red Hat provides open source software solutions that customers are allowed to update, monitor and manage. Wall Street appears to agree with the stock downgrade, with share prices dropping 7.5% over the past month. The stock’s trailing PE Ratio is 65.70. To get an in-depth look at RHT, get Portfolio Grader’s complete analysis of RHT stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.