im desperate, i paid for subscription and not able to use it.

Use the Adobe Cleaner tool to wipe Photoshop off your system followed by a re-install.

Use the Creative Cloud Cleaner Tool to solve installation problems

check your account to verify your subscription is what you expect and to verify your adobe id (used in the next step), https://accounts.adobe.com/

if your account shows

a. your subscription is active,

1.  sign out and then back in to your cc desktop application using the same adobe id above to verify your subscription:  http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html

2.  if that fails, https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

3.  if that fails, https://helpx.adobe.com/creative-cloud/kb/cc-reverts-to-trial.html

4.  if that fails, using a browser that allows popups and cookies,  contact adobe support during pst business hours by clicking here and, when available, click 'chat', http://helpx.adobe.com/x-productkb/global/service-ccm.html

if your account shows

b. you have no subscription and you're paying for one

1. using a browser that allows popups and cookies,  contact adobe support during pst business hours by clicking here and, when available, click 'chat', http://helpx.adobe.com/x-productkb/global/service-ccm.html