I almost reformatted last night because I could NOT get rid of Steam. Here is what happened. A while back I bought a SSD for my OS and kept my original drive not as a primary boot, but as a backup just in-case. I was cross running programs, Steam being one of them to play COD. Well last night after a horrible experience with iTunes and the fact I was satisfied with my SSD I decided to backup what I wanted from my old OS drive and reformat it so I had the extra space.
Everything went smoothly, except Steam. I tried to reinstall Steam on multiple occasions and it kept telling me "error 1324 the path contains an invalid character". I tinkered around a bit in win uninstall, regedit, safemode... it simply was not there. I even manually tried to delete anything related to Steam. I was confused. Every time I thought I manually deleted it or tried to install Steam it gave me that 1324 error. I was getting steamed at this point
Initially I remembered Revo Uninstaller and it still would not uninstall because the file was simply not there. I finally went into advanced mode in Revo and just deleted the whole registry and anything that even smelled like steam. I reset my tower, reinstalled Steam on one of my other partitions... it runs perfectly now!
2 hours later I could play COD:MW2.