This week, the overall grades of 7 Software stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Oracle Corporation (ORCL) is having a tough week. The company’s rating falls from a C to a D. Oracle Corporation provides enterprise software and computer hardware products and services. For more information, get Portfolio Grader’s complete analysis of ORCL stock.

Mentor Graphics Corporation (MENT) slips from a C to a D this week. Mentor Graphics Corporation manufactures, markets, and supports software and hardware electronic design automation products. The company also gets F’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of MENT stock.

This is a rough week for VASCO Data Security International, Inc. (VDSI). The company’s rating falls to F from the previous week’s D. VASCO Data Security International, Inc. designs, develops, markets and supports open standards-based hardware and software security systems that manage and secure access to information assets. The company also gets F’s in sales growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of VDSI stock.

Park City Group, Inc. (PCYG) gets weaker ratings this week as last week’s C drops to a D. Park City Group, Inc. provides software and consulting services for business productivity. For more information, get Portfolio Grader’s complete analysis of PCYG stock.

Upland Software, Inc. (UPLD) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in earnings surprise and return on equity. For more information, get Portfolio Grader’s complete analysis of UPLD stock.

This week, Zynga Inc. Class A’s (ZNGA) rating worsens to a D from the company’s C rating a week ago. Zynga Inc. Class A develops, markets, and operates online social games as live services played over the Internet and on social networking sites and mobile platforms. For more information, get Portfolio Grader’s complete analysis of ZNGA stock.

Slipping from a D to a F rating, Sky-mobi Ltd. Sponsored ADR (MOBI) takes a hit this week. Sky-mobi Ltd. Sponsored ADR engages in the operation of a mobile application platform embedded on mobile phones to provide mobile application store and services in the People’s Republic of China. The company also gets F’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of MOBI 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.