I tried to install shockwave player 10 (on XP SP2) but it keeps telling me I need administrator rights. This is a home machine, however I'm not using the "administrator" account, but User Accounts says I am in fact in the administrator group. I don't know the Administrator password nor does anyone else who uses this computer. I saw an option to reset the administrator password, however it might result in lost data.

What's further puzzling is that, while trying to install Windows Media Player 11, I get an error that says setup was unable to complete... and searching around the internet I noticed this was also a common symptom of not having full admin rights.

Any suggestions?