In need of a little help!!!! (can't reinstall LW)

[idz]

Greetings to all! I am 1 hour old and am pretty new at this stuff.
I run a hp 2.6 GHz pc, 768 mb, windows XP home edition. I use to have LM installed on my pc but it uninstalled itself. Then, I tried to dwnld LW again to no avail.
I have tried some of the tips listed in FAQ but have had no success. I also uninstalled java then dwnlded the latest version. No affect. I have tried to delete LW but I get "access denied". When dwnld LW it cannot copy files, access denied. The LW programe does not show in add/remove programmes so I cannot remove it. When dwnld my pc says do I want to remove/replace existing files, I say yes, error occurs "access denied chk disc space ...
I am at my wits end. I wld appreciate some help.
Thanx