Whole OS encryption



I am considering whole OS encryption as this seems to me the safest choice. I use Windows XP Home and the idea is that everytime I switch on the computer a password will be asked and the operating system with its contents decrypted on switching it off the whole OS will be encrypted again, and if the OS crashes it will encrypt too.

I have found two companies that offer this service Safeboot http://www.safeboot.com and Securestar http://www.securestar.com but I have absolutly no experience with this although I have been using virtual encrypted disks for a long time (i.e. Truecrypt,Bestcrypt,Steganos).

The idea of encrypting the whole OS seems very smart to me as it saves times and in my view it makes it harder to get into as virtually everything is encrypted, I wanted to know the oppinion of the experts...

Two things I am concerned with:

1) Algorythm used to make the encryption, I do not want to use a close source or untested algothym I will only feel comfortable with AES,Blowfish,Twofish or something like that. I think it is what professional cryptographers always reccomend.

2) Perfomance of the encrypted OS under normal circumstances, email,internet,openoffice,pdf.

If anybody has used Securestar or Safeboot please let me know who it went. Thanks.
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