Steps To Install WSP file using STSADM

1. Add the solution
stsadm -o addsolution -filename {WSPFILENAME}
2. Deploy the solution
stsadm -o deploysolution -name {WSPFILENAME} -url {SITEURL}
3. Install the feature
stsadm -o installfeature -filename {FeatureFolder}\feature.xml
4. Activate the feature
stsadm -o activatefeature -id {FEATUREID} -url {SITEURL} -force
5. Deactive the feature
Stsadm.exe -o deactivatefeature -filename “C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\ViewFormPagesLockDown\feature.xml” -ur http://servername/
6.Uninstall the feature
stsadm -o uninstallfeature -filename
7.Retract Solution
stsadm -o retractsolution
-name
[-url]
[-allcontenturls]
[-time]
[-immediate]
8.Delete Solution
stsadm -o deletesolution
-name

To Remove a solution type the following

1.  Log into your Sharepoint Server and open command prompt as administrator.
2. Type: stsadm -o restractsolution -name YourWebPart.wsp -immediate -allcontenturls
3. stsadm -o deletesolution -name YourWebPart.wsp.