Slow transfer speeds to USB 2.0 flash drive

Hi all,

I know that this topic has appeared once or twice in these forums but there haven't been any resolutions and they've been quiet lately so I started a new one. 

Recently, I migrated from Windows XP to 7 and found this problem. When I try to copy a file (a 1.2GB video) to a usb flash drive that I know is usb 2.0 hi-speed (copying files to it in xp were really fast) it takes over 2 minutes. 7 reports that it is copying at 3-4 MB/sec. When I copy from the flash drive to my computer it copies at about 9-10MB/sec. I've also tried plugging it into the rear ports but that doesn't change the transfer speed at all. I know it isn't something related to the flash stick itself because transferring files to it in xp were a lot faster.

Some random information: Transferring files from one hard drive to another averages at about 60MB/sec (both of the hard drives are SATA II drives). I'm not sure what speed it should be but it doesn't feel drastically slower than on my xp machine. Windows 7 and my device drivers are all up-to-date.

System specs:

Dell optiplex GX620

Pentium 4 3.2GHz

2GB Ram

Windows 7 Professional 32-bit

AVG 9 free edition anti-virus

My setup is almost identical to how it was on my windows xp machine except I have less programs installed so there isn't something new that could have caused problems.