Hoster won't open!

[EmilioM]

This past Fri. and Sat. the 10th & the 11th I did my shows and had no problems. Yesterday the 14th I did maintenance on my computer, ran Norton antivrus, and Tuneup utilities to defrag and clean up unnecessary files, and today I went to start up Hoster and got the window that says Hoster - Convert HDZIP Files, which is normal. I hit the cancel button like I always do and it beeped like normal and normally Hoster starts up after that, but it didn't. I right clicked on Hoster and hit properties and got Error processing file: H:\MTU\HOSTER\songs.mdb, and another saying Disk or Network error (3043). Also just want to say H is my hard drive. I went to My Documents, and Hoster 4.08 isn't there, even though 4.06, 4.05, and 4.03 are there. I tried redownloading 4.08 and installed it, but the same thing happened, then i installed 4.06 and then 3.4, but they won't open either. I have a Gateway GT5034 with Athlon 64x2 dual core running at 2.2Ghz, 2gig memory, NVidia GeForce 7300GS with 512mb memory, 320gig HD with 293 gig allocated to H drive and 65 gig free, and 2 Plextor 755SA DVD drives. HELP! EmilioM.