i want my computer to have a complete 20gig drive like it did before
If you didn't make a boo-boo to your HDD it is still "a complete 20gig drive", it just has a better filesystem on it
In any case, do you have WinNT/Win2k/WinXPpro install CD or boot floppies? Just pop it in, let the system boot from, go through boot process, in the drives setup screen it will tell you that windows found alien partitions (your real linux partitions), delete them
, and format
them into NTFS/FAT (32 pigs), after it is done quit the installation.