While you trying to upload and delete infopath to centeral administrator . you may get this error:

"A deployment or retraction is already under way for the solution "infopathformname.wsp", and only one deployment or retraction at a time is supported."

To solve this error do the following steps

1) Go to Centeral administration(I am assuming that you have permission for this)
2) Operations tap
3) Under Global Configuration there is Timer Job Definitions
Click the Timer Job Definitions, then you should be able to see the list of "infopathformname.wsp" . delete it

4) then run this command "stsadm.exe -o execadmsvcjobs"