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”).

SRS Labs (NASDAQ:SRSL) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. SRS Labs develops and licenses audio and voice enhancement technologies. In Portfolio Grader’s specific subcategories of Earnings Growth and Margin Growth, SRSL also gets F’s. For a full analysis of SRSL stock, visit Portfolio Grader.

TeleNav Inc. (NASDAQ:TNAV) experiences a ratings drop this week, going from last week’s C to a D. TeleNav provides location-based solutions. The stock gets F’s in Earnings Growth, Earnings Momentum, and Margin Growth. For more information, get Portfolio Grader’s complete analysis of TNAV stock.

This week, Red Hat’s (NYSE:RHT) rating worsens to a D from the company’s C rating a week ago. Red Hat provides open source software solutions that customers are allowed to update, monitor and manage. The trailing PE Ratio for the stock is 62.90. To get an in-depth look at RHT, get Portfolio Grader’s complete analysis of RHT stock.

Taomee Holdings (NYSE:TAOM) earns a D this week, falling from last week’s grade of C. Taomee Holdings produces children’s entertainment. The stock gets F’s in Earnings Surprise and Margin Growth. The stock price has dropped 9.2% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. For a full analysis of TAOM stock, visit Portfolio Grader.

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.