1. Open Settings.
2. Select Accounts and Sync.
3. Tap Google Account.
4. Tap the 3 dot.
5. Select Remove account.
6. Log in your Google Account again.
If that did not worked, clear Google Apps Cache.
1. Open Settings.
2. Select Application Manager.
3. Swipe left until you go to All.
4. Select Google Play Store.
5. Tap Force Stop.
6. Tap Clear Data and Clear Cache.
7. Press Back and select Google Play Service.
8. Tap Force Stop.
9. Tap Clear Data and Clear Cache.
10. Press back again then select Google Services Framework.
11. Also Tap Force Stop.
12. Tap Clear Data and Clear Cache.
Now if nothing really works, I want you to update Google Play Store.
1. Open Settings.
2. Select Security.
3. Check Unknown Sources.
4. Go back to your Home Screen.
5. Open your Internet browser.
6. Go to this link
Download Google Play Store.
7. Wait for the Download to finish.
8. Tap it to install.
If you did not found your device in the Supported list you need to use other app market/ Google Play Alternative.
1. 1. Open Settings.
2. Select Security.
3. Check Unknown Sources.
4. Go back to your Home Screen.
5. Open your Internet browser.
6. Go to SlideMe.org
7. On the website tap download.
8. Tap the APK file after the download to install it.
9. You can download apps and games from SlideMe Market.