Ek wil playstore reinstall

it appears the google services app may need resetting (android settings > app manager > google services > clear data) this will reset the tablet's memory of whats installed until the playstore app is opened again if it fails let me know

use the browser to reinstall Play

In order for your tablet to have a working Playstore, it must be compatible with Playstore.
The reason that I? telling you this is because a lot of people buy a used tablet, with third party software in which force a Google app into the tablet.
Since there is no detail about the tablet, I can only guess.
Go to settings>app. From here search for Google Services, if there is none, then it means that you must install it for your device or update it. If there is none for your device, then it means that your device does not support Playstore.

Suggest to first try logging into Facebook using the browser on your tablet instead of the facebook app. If that display is normal in size ... it's probably easiest to
(1) uninstall the Facebook App (Control/Settings/Apps);
(2) reboot the Tablet;
(3) Restart the Tablet and Go to the Google Playstore ...reinstall the Facebook app.

I suggest that you troubleshoot first, instead of a hard reset. Factory reset is within settings.
If any google app won't download nor install, it's probably because your google services are not updated or is corrupted. Try the next steps before factory reset.
1. Go to settings, scroll down to app.
2. From here search for PlayStore and tap it.
3. Tap Clear Cache and Clear data.
4. Go Back.
5. Search now for Google services, this one is not under the download tab, which you can notice at the top of the screen, instead got to All and scroll down until you find it.
6. Tap Clear Cache and Clear data if available.
7. Reboot phone or tablet.
Most of the time this procedure do work, some people also opt to remove the google account and sign in after the reboot.
After the boot, open the PlayStore, accept the agreement and try to download anything from the PlayStore that is compatible with your tablet. Also, just to be sure, go to settings, security, look for Unknown Sources and enable it. This feature allow you to install any apk file that is not from the PlayStore.

Your tablet is more likely a chinese no name one.
You can download the Play Store standalone version from here:
APK 12 FEB 2015 Google Play Store v5 2 13 Newest version unmodded

Make sure you have a wifi connection. Playstore is on the internet so you have to be able to access the internet.
Also, if the Playstore app that came installed on the tablet is lost or needs re-installed for some reason, then you won't be able to re-install it on your tablet unless you also have gmail running on the tablet or google+ or some other app that Google can use to identify you as the tablet owner.

Make sure by going to the Application Manager under Settings and verify that you haven't just lost the icon on some page. The playstore is normally loaded as part of the operating system for your device. There are places where you can download an installable file for the playstore, but some devices will not allow installation of downloaded .apk files, or require you to turn off a setting that prohibits installing downloaded files. Without knowing the mfr and model number of your device, who knows what you would have to do to get this app reinstalled if you truly have somehow deleted it.
Google Play Store 5 0 38 APK Download APKMirror

Yes it will give learners more help and they will also learn how the technology is developing

Yes you will be able to reinstall Windows xp if you het a new hard drive and a cdrom that works for this laptop. You can also try a external cdrom